Card 6d84e46a

1. #1Vol 1

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 1-3

   Volume 1: Diabolos of the Old School Building

   (AKA: Reincarnated as a Devil)

   1. Key Characters

   • Issei Hyodo: The protagonist. A perverted high school student who is killed on his first date.
   • Rias Gremory: The main heroine. A high-class Devil from the Gremory clan and the "King" of the Occult Research Club (ORC). She reincarnates Issei as her servant.
   • Raynare (Yuma Amano): A Fallen Angel who poses as Issei's first girlfriend to assassinate him.
   • Asia Argento: A kind-hearted Nun who is exiled from the Church for her ability to heal Devils.
   • ORC Members: Akeno Himejima (Queen), Kiba Yuuto (Knight), Koneko Toujou (Rook).

   2. Core Plot Summary

   • Death & Reincarnation: Issei Hyodo lands his first-ever date, "Yuma Amano," only to be murdered by her. She reveals herself as the Fallen Angel, Raynare. As he dies, Issei unknowingly summons Rias Gremory.
   • A New Life: Rias saves him by reincarnating him as a Devil and making him her "Pawn" (taking all 8 of her pawn pieces). Issei joins the Occult Research Club, which is the base for Rias's peerage.
   • The Sacred Gear: Issei learns he possesses a powerful Sacred Gear called the [Boosted Gear], which holds the spirit of the Welsh Dragon, Ddraig. This is why Raynare targeted him.
   • Saving Asia: Issei befriends Asia Argento, a gentle Nun. Raynare and her Fallen Angel collaborators kidnap Asia to extract her healing Sacred Gear, [Twilight Healing], which kills her in the process.
   • First Battle: Enraged, Issei and the ORC confront Raynare. With the new power of his [Boosted Gear], Issei defeats the Fallen Angel. Rias, moved by Issei's wish, uses her "Bishop" piece to reincarnate Asia Argento as a Devil and a member of her household.

   3. Key Lore & Concepts

   • The Three Factions: Devils, Fallen Angels, and Angels are in a tense ceasefire after a catastrophic war.
   • Evil Pieces: A chess-based system used by high-class Devils to reincarnate other beings into their "peerage" or "household." (King, Queen, Rook, Knight, Bishop, Pawn).
   • Sacred Gears: Miraculous items created by the God of the Bible, bestowing a wide range of abilities on their human hosts.
   • Boosted Gear: One of the 13 "Longinus" (top-tier Sacred Gears). It has the ability to double the user's power every 10 seconds.
2. #2Vol.2

   Keys:

   Enabled · Order 100

   Entry settings

   Volume 2: Phoenix of the Battle School

   (AKA: The Fighting Phoenix)

   1. Key Characters

   • Riser Phoenix: A high-class Devil from the Phoenix clan. He is Rias Gremory's fiancé, chosen through an arranged marriage.
   • Gremory Peerage: The full focus is on Rias's team and their training.
   • Grayfia Lucifuge: A powerful Devil and the "Queen" of Sirzechs Lucifer (Rias's older brother). She serves as the referee for the Rating Game.

   2. Core Plot Summary

   • The Engagement: Riser Phoenix, a Devil with immortality due to his clan's regeneration, arrives to claim Rias as his wife. Rias is vehemently opposed to the marriage.
   • The Rating Game: To win Rias's freedom, her household (the ORC) challenges Riser's full 15-member peerage to a "Rating Game" — a formal, high-stakes battle between Devils.
   • Training & Defeat: The ORC, especially Issei, undergoes intense training. However, they are inexperienced and outmatched. In the official game, Riser's peerage strategically defeats Rias's members one by one, culminating in Issei's defeat and Rias's surrender to save him.
   • The Interruption: Riser's engagement party (which is also the wedding) begins in the Underworld. Issei, unable to accept the loss, makes a deal with his Sacred Gear, Ddraig.
   • Sacrifice & Victory: Issei crashes the party. He sacrifices his left arm to Ddraig to gain temporary, immense power: the [Balance Breaker] (Scale Mail armor). He challenges Riser to a one-on-one duel. Issei's new power, combined with holy water (a Phoenix's weakness), overwhelms Riser. Issei wins, and Rias's engagement is broken.

   3. Key Lore & Concepts

   • Rating Game: The formal combat sport of the Devils, used to settle disputes and determine social standing. It is a simulated battle between two peerages.
   • Balance Breaker: The "forbidden" evolution of a Sacred Gear, granting the user a massive increase in power. Issei's is the [Boosted Gear Scale Mail], a full suit of red dragon armor.
   • Phoenix Clan: A Devil clan with the unique ability of rapid regeneration, making them virtually immortal in combat.
3. #3Vol.3

   Keys:

   Enabled · Order 100

   Entry settings

   Volume 3: Excalibur of the Moonlit Schoolyard

   (AKA: The Holy Sword Arc)

   1. Key Characters

   • Kiba Yuuto: The "Knight" of Rias's peerage. This volume focuses on his dark past.
   • Xenovia Quarta: A "Sword-Wielder" from the Catholic Church, sent on a mission. Wields the Holy Sword "Durandal."
   • Irina Shidou: Issei's childhood friend, now partnered with Xenovia. She wields a "Mass-Produced Holy Sword."
   • Kokabiel: A 10-winged Fallen Angel leader and the main antagonist. He is a warmonger who wants to restart the Great War.
   • Freed Sellzen: A maniacal, rogue Exorcist working with the Fallen Angels.

   2. Core Plot Summary

   • The Holy Swords: Xenovia and Irina arrive in town to retrieve stolen fragments of the legendary Holy Sword, "Excalibur," from the Fallen Angels.
   • Kiba's Vengeance: The word "Excalibur" triggers Kiba. He reveals he was the sole survivor of a cruel Church experiment called the "Holy Sword Project," where all his friends were sacrificed trying to wield Excalibur. He lives for revenge.
   • The Alliance: The stolen swords are held by Freed Sellzen, who is working for Kokabiel. Kiba's desire for revenge causes him to temporarily leave the ORC.
   • The Plot Revealed: Kokabiel's true goal is exposed: he wants to use the stolen Excaliburs to attack the Devils in Kuoh Town, thereby provoking a new Great War among the Three Factions.
   • The Battle: The Gremory peerage and the Church's exorcists (Xenovia & Irina) form a temporary alliance to stop Kokabiel. Kiba confronts his past and, with his friends' help, achieves his own Balance Breaker: [Sword of Betrayer], which fuses Holy and Demonic power.
   • The White Dragon: Before Kokabiel is defeated, he is stopped and easily captured by Vali Lucifer, the wielder of the [Divine Dividing] (the White Dragon Emperor) and a rival to Issei. Vali also drops a bombshell: "The God of the Bible is dead."
   • Aftermath: Having learned God is dead, a disillusioned Xenovia is branded a heretic. Rias invites her to join her peerage, and Xenovia is reincarnated as a Devil, becoming Rias's second "Knight."

   3. Key Lore & Concepts

   • Excalibur: The original Holy Sword, now shattered into multiple fragments, each with a different power.
   • The Holy Sword Project: A secret, inhumane Church experiment that attempted to create artificial Holy Sword wielders, resulting in the deaths of many children (including Kiba's friends).
   • "God is Dead": A major revelation that shakes the worldview of the Three Factions. The Great War ended with the deaths of not only the original Devil Kings but also the God of the Bible.
   • The White Dragon Emperor: Vali Lucifer, the host of the [Divine Dividing], the rival Sacred Gear to Issei's [Boosted Gear].
4. #4Vol 4~6

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 4-6

   Volume 4: Vampire of the Suspended Classroom

   1. Key Characters

   • Gasper Vladi: The Gremory peerage's second "Bishop," a half-vampire, half-human crossdresser with a powerful time-stopping Sacred Gear, [Forbidden Balor View]. He is a shut-in (hikikomori) who was sealed by Rias due to his inability to control his power.
   • Azazel: The Governor-General of the Fallen Angels. He is a laid-back leader and Sacred Gear researcher who comes to Kuoh Town as a "supervisor."
   • Michael: The leader of the Angels (following God's death). He comes to Kuoh Town seeking peace.
   • Vali Lucifer: The White Dragon Emperor (Vanishing Dragon). He is revealed to be a descendant of the original Devil King Lucifer and the wielder of the [Divine Dividing], a Longinus that halves the power of his opponent.
   • Ophis: The Ouroboros Dragon, also known as the Infinite Dragon God. She is the leader of the Khaos Brigade, a terrorist organization.

   2. Core Plot Summary

   • The New Bishop: Rias unseals Gasper Vladi, her other Bishop, whom she keeps in a locked room in the club. Gasper's Sacred Gear, [Forbidden Balor View], stops time for everything he looks at, but he has no control over it.
   • The Peace Summit: The leaders of the Three Factions—Sirzechs Lucifer (Devils), Azazel (Fallen Angels), and Michael (Angels)—convene at Kuoh Academy for a historic peace conference.
   • Khaos Brigade Attack: The summit is attacked by the Khaos Brigade, led by Katerea Leviathan (an Old Satan Faction descendant). During the chaos, Gasper, with Issei's help, learns to control his power (by drinking Issei's blood) to freeze the attackers.
   • White Dragon vs. Red Dragon: Vali Lucifer reveals himself as the leader of the Khaos Brigade's "Vali Team." He fights Issei, easily overwhelming Issei's still-incomplete Balance Breaker.
   • A New Alliance: Despite the attack, the peace treaty is successfully formed. Azazel, having "resigned" as Fallen Angel leader, becomes the new advisor for the Occult Research Club, and the Gremory group becomes a key peacekeeping force.

   3. Key Lore & Concepts

   • Khaos Brigade: A global terrorist organization founded by Ophis. Its goal is to disrupt the current world order. It is comprised of various factions, including descendants of the Old Satan (Devil Kings) and other rogue elements.
   • The Two Heavenly Dragons: The eternal rivalry between Ddraig (Red Dragon Emperor) and Albion (White Dragon Emperor) is explained. Their spirits are sealed in the [Boosted Gear] and [Divine Dividing], respectively, and their hosts are fated to fight.
   • [Forbidden Balor View]: A Sacred Gear that can freeze time on its targets. Gasper's cross-dressing is a (failed) attempt to mitigate his vampiric nature.

   ---

   Volume 5: Hellcat of the Underworld Training Camp

   1. Key Characters

   • Kuroka: Koneko's older sister. A "Nekoshou" (cat-person yokai) and an SS-class stray Devil who murdered her master. She is a member of the Vali Team and the Khaos Brigade.
   • Sona Sitri: The student council president of Kuoh Academy and the heir to the Sitri Devil clan. She is Rias's childhood friend and rival.
   • Odin: The Chief God of Norse Mythology, who appears as a lecherous old man.
   • Loki: The Norse God of Mischief and the main antagonist of this volume. He opposes the new alliance.

   2. Core Plot Summary

   • Underworld Training: The entire Occult Research Club travels to the Underworld for summer training. Issei trains under Tannin, a former Dragon King, to better control his Balance Breaker.
   • Koneko's Past: Koneko's sister, Kuroka, appears. It is revealed that Koneko (real name: Shirone) and Kuroka are rare Nekoshou, and Kuroka became a stray Devil after killing their master to protect Koneko. This encounter causes Koneko to emotionally withdraw.
   • Rating Game vs. Sitri: Rias's peerage and Sona Sitri's peerage engage in their first official Rating Game. The match is a display of high-level strategy, but it is interrupted.
   • Loki's Attack: The gathering of Young Devils is attacked by the Norse god Loki and his son, Fenrir. Loki seeks to trigger "Ragnarok" (the twilight of the gods) and opposes the alliance.
   • Mjölnir: Issei, with help from Akeno and Rias, is able to wield a "fake" Mjölnir (Thor's Hammer) to defeat Loki. Following the battle, Odin's Valkyrie bodyguard, Rossweisse, is abandoned by Odin and subsequently joins Rias's peerage as her second "Rook."

   3. Key Lore & Concepts

   • Nekoshou: A race of cat-like Yokai with powerful "Senjutsu" and "Youjutsu" (magic). They were nearly wiped out by Devils.
   • Norse Mythology: The DxD world is confirmed to include many pantheons, including the Norse gods (Odin, Loki, Thor), who exist alongside the Three Factions.
   • New Peerage Member: Rossweisse, a Valkyrie and magic expert, is reincarnated as Rias's "Rook."

   ---

   Volume 6: Holy Behind the Gymnasium

   1. Key Characters

   • Diodora Astaroth: A high-class Devil whom Asia healed when she was still a Nun. He appears as a kind suitor proposing to Asia but is secretly a cruel and sadistic Devil allied with the Khaos Brigade.
   • Shalba Beelzebub: A descendant of the original Devil King Beelzebub and a leader in the Old Satan Faction.
   • Ophis: The leader of the Khaos Brigade, who appears personally.

   2. Core Plot Summary

   • The Proposal: Diodora Astaroth proposes to Asia. He is also Rias's next scheduled opponent in a Rating Game. He suggests a wager: if he wins, he marries Asia.
   • The Ambush: During the Rating Game, Diodora's true, sadistic nature is revealed. The game was a trap; he allies with the Khaos Brigade and kidnaps Asia, intending to extract [Twilight Healing] from her.
   • Issei's Rage: Diodora brutally reveals that he was the one who ordered the Fallen Angels (including Raynare) to kill Issei in Volume 1, all to make Asia fall into despair so he could "save" her.
   • Juggernaut Drive: Shalba Beelzebub appears and "kills" Asia by teleporting her into the Dimensional Gap. The shock and grief are too much for Issei. He bypasses the normal Balance Breaker and activates the "forbidden" form: [Juggernaut Drive].
   • Berserk Dragon: In this form, Issei is a mindless beast of pure power. He easily kills Diodora and murders Shalba. However, the form rapidly consumes his life force and he cannot be stopped.
   • The Song: Vali and his team intervene. They retrieve Asia (who was saved by Vali's team) and use a "song" (created by Azazel and the others, based on Issei's perverted nature) to calm Issei's rage and revert him from Juggernaut Drive.

   3. Key Lore & Concepts

   • Juggernaut Drive: A catastrophic transformation that unlocks the sealed power of the Heavenly Dragons, but at the cost of the user's sanity and life force. It is triggered by extreme negative emotions.
   • Dimensional Gap: The "nothingness" that exists between worlds (like the Underworld, Heaven, and Earth). It is where Ophis and the "True Dragon" Great Red reside.
   • Issei's Lifespan: As a consequence of using Juggernaut Drive, Issei's life is drastically shortened.

   This video provides a fan-made animation visualizing the battle from Volume 6, where Issei first unleashes his Juggernaut Drive. Issei's Berserk Form

5. #5Vol 7~9

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 7-9

   Volume 7: Rias's First Rating Game

   (AKA: We Will Start the Rating Game)

   1. Key Characters

   • Sona Sitri & Sitri Peerage: Rias's rival and her peerage, who are the main opponents in this volume.
   • Saji Genshirou: Sona's "Pawn" (who holds 4 pawn pieces) and Issei's perverted rival.
   • Baraqiel: A leader (Cadre) of the Fallen Angels and Akeno's estranged father.

   2. Core Plot Summary

   • Akeno's Past: The volume's B-plot focuses on Akeno. Her father, the Fallen Angel executive Baraqiel, comes to town. Akeno's hatred for him (for "abandoning" her and her human mother) is revealed. Issei helps her confront her trauma, and she begins a slow reconciliation, finally embracing her dual Devil/Fallen Angel heritage.
   • The Rating Game: The main plot is the official Rating Game between Rias Gremory and Sona Sitri. Unlike the battle with Riser, this is a highly technical and strategic match of "wits" rather than pure power.
   • New Moves: Issei, realizing he's a "one-trick pony," develops new, perverted-but-effective techniques.
     • [Bilingual]: A skill allowing him to talk to Ddraig (his Sacred Gear) to plan strategies.
     • [Dress Break]: A move that channels demonic power to strip female opponents' clothing.
   • Conclusion: The Gremory team, using their unique abilities and Issei's unconventional tactics (like stripping Sona's team), secures a hard-fought victory against the highly-coordinated Sitri team.

   3. Key Lore & Concepts

   • Holy-Lightning: Akeno's unique, signature power. It's a hybrid ability combining her mother's holy "lightning" magic (from her priestess lineage) and her father's Fallen Angel "lightning."
   • Rating Game (Official): This volume provides the first in-depth look at a real, non-emergency Rating Game, showcasing its rules, broadcast, and strategic depth.
   • Middle-Class Devil: Issei's new goal is to be promoted from a Low-Class Devil to a Middle-Class Devil, which would grant him more freedom and respect.

   ---

   Volume 8: The Devil's Work

   (AKA: The Fun-Loving Devil)

   1. Key Characters

   • Occult Research Club (ORC): This volume focuses on the team's professional development as Devils.
   • Freed Sellzen: The maniacal, rogue Exorcist from Volume 3 returns.
   • Hero Faction (Mentioned): The first hints of a new, dangerous faction are dropped.

   2. Core Plot Summary

   • Official Devil Job: The ORC takes on its first official "Devil Job" as a team. Their mission is to hunt down a Stray Devil that has been terrorizing a local area.
   • Stray Devil Hunt: The mission is more complicated than expected. They encounter the newly-revived Freed Sellzen, who is now working with the Khaos Brigade.
   • Issei's Promotion: Issei uses the mission to prove his worth. By showcasing his ability to lead, protect his comrades, and defeat a significant threat (a mutated Stray Devil), he successfully fulfills the requirements for a promotion.
   • Mid-Class Devil: At the end of the volume, Issei is officially promoted to a Middle-Class Devil. This is a major milestone, as it allows him to (in theory) one day have his own peerage.

   3. Key Lore & Concepts

   • Devil Job System: Provides a look at the day-to-day life and formal work of Devils, which includes fulfilling contracts (from humans) and performing "public safety" tasks like hunting Stray Devils.
   • Stray Devils: What happens when a reincarnated Devil betrays or murders their "King" (master). They are hunted down and executed by the official Devil government.
   • Promotion System: Demonstrates that Devils have a clear-cut class hierarchy (Low, Middle, High, Ultimate) and that promotion is possible through significant achievements.

   ---

   Volume 9: Pandemonium at the School Festival

   (AKA: The School Trip is Pandemonium)

   1. Key Characters

   • Kunou: A young, nine-tailed fox girl (Kitsune) and the daughter of the Kyoto Yokai leader.
   • Yasaka: The leader of the Kyoto Yokai and a Nine-Tailed Fox (Kyubi). She is Kunou's mother.
   • Cao Cao: The main antagonist. The leader of the "Hero Faction" of the Khaos Brigade and the wielder of the most powerful Longinus, the [True Longinus].
   • Hero Faction: Cao Cao's team of Sacred Gear users, including Heracles (wielder of [Berserk]) and Georg (wielder of [Dimension Lost]).

   2. Core Plot Summary

   • Kyoto School Trip: The ORC (minus Rias, who has Underworld business) travels to Kyoto for their official school trip.
   • Yokai Encounter: Issei and the group meet Kunou, who mistakes them for enemies. Her mother, Yasaka, has been kidnapped.
   • The Hero Faction: The kidnappers are revealed to be the Hero Faction, a human-supremacist subgroup of the Khaos Brigade. Their leader, Cao Cao, plans to use Yasaka to summon the Great Red (the True Dragon) and test his own power.
   • The Attack: The Hero Faction attacks Kyoto, forcing the ORC and the local Yokai to defend the city.
   • A New Alliance: Rias and the Gremory forces arrive as reinforcements. This volume sets the stage for the full-scale battle that occurs in Volume 10.

   3. Key Lore & Concepts

   • Yokai Faction: A new major, non-Biblical faction is introduced. The Yokai of Japan (led by Yasaka) are a powerful, neutral force.
   • Hero Faction: A dangerous new branch of the Khaos Brigade, composed entirely of human Sacred Gear users. They believe humans, not gods or devils, should rule the world.
   • [True Longinus]: The original "Holy Spear" that pierced Christ. It is the most powerful of the 13 Longinus and is wielded by Cao Cao. It has the power to kill Gods.
6. #6Vol 10~12

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 10-12

   Volume 10: Lion Heart of the School Festival

   (AKA: The Lion Heart of the First Rating Game)

   1. Key Characters

   • Cao Cao: Leader of the Hero Faction, wielder of the [True Longinus]. The main antagonist.
   • Hero Faction: Cao Cao's team of Sacred Gear users (Heracles, Georg, Siegfried, Jeanne).
   • Saji Genshirou: Sona Sitri's "Pawn." He plays a crucial role in this volume, showcasing his Vritra Sacred Gear's abilities.
   • Sona Sitri & Peerage: Arrive in Kyoto as reinforcements alongside Rias.
   • Vali Team: Arrives to settle their own score with the Hero Faction.

   2. Core Plot Summary

   • The Battle Continues: This volume picks up immediately from Volume 9, in the midst of the Hero Faction's attack on Kyoto. The Occult Research Club (ORC) teams up with the Kyoto Yokai to defend the city and rescue Yasaka.
   • Issei's New Form: During the fight, Issei is pushed to his limits. Azazel helps him unlock a new, more stable form called the [Illegal Move Triaina]. This allows Issei to temporarily change his "Pawn" promotion trait to that of a Knight (speed), Rook (defense), or Bishop (magic), giving him tactical versatility.
   • Saji's Promotion: Saji also unveils his own new form, [Vritra Promotion], allowing him to use Vritra's dark flames and absorption lines.
   • Issei vs. Cao Cao: Issei confronts Cao Cao. While Issei's new forms are impressive, Cao Cao's [True Longinus]—with its ability to create miracles, destroy holy objects, and even bend reality—is on another level.
   • Climax: The battle becomes a massive brawl involving the Gremory peerage, Sitri peerage, Vali Team, and Hero Faction. Cao Cao is eventually forced to retreat, but not before Issei lands a solid "dragon punch" on him.
   • Aftermath: Yasaka is rescued. Rias Gremory, after seeing Issei risk everything, finally confesses her love to him, and they officially become a couple.

   3. Key Lore & Concepts

   • [Illegal Move Triaina]: Issei's temporary, mid-level power-up. It's an "illegal" technique that allows a "Pawn" to promote to a piece other than a Queen.
   • [True Longinus]: The first and most powerful Longinus. It's the "Holy Spear" and has the power to kill gods. Cao Cao's mastery of it makes him arguably one of the strongest humans alive.

   ---

   Volume 11: Ouroboros and the Attack on the Gremory Family

   (AKA: The Attack on the Young Devils Gathering)

   1. Key Characters

   • Shalba Beelzebub: A descendant of the original Beelzebub and a member of the Old Satan Faction.
   • Siegfried: A member of the Hero Faction and wielder of multiple [Dragon Slayer] swords.
   • Ophis: The Ouroboros Dragon (Infinite Dragon God) and leader of the Khaos Brigade.

   2. Core Plot Summary

   • Young Devils Gathering: Issei and the ORC attend a major political event in the Underworld for all young Devils. The event is suddenly attacked by the Hero Faction and the Old Satan Faction, who have formed a temporary alliance.
   • Cao Cao's True Motive: Cao Cao's goal is to force the Dragon God, Ophis (who is allied with them), to send the "soul" of the "Poison of God," Samael, into the Dimensional Gap.
   • Issei's Ultimate Form: During the chaotic battle, Issei pushes past his [Triaina] form and unlocks his true "Queen" promotion: [Cardinal Crimson Promotion]. This is the true, stable version of his [Boosted Gear] Balance Breaker, a powerful, crimson dragon armor.
   • Issei vs. Cao Cao (Round 2): Issei, in his new form, is able to fight on par with Cao Cao.
   • Issei's "Death": The battle is interrupted. Siegfried (a Dragon Slayer specialist) and Shalba Beelzebub attack. Issei is struck by a [Dragon Slayer] sword, and Cao Cao's spear (laced with Samael's god-killing poison) also wounds him.
   • Heroic Sacrifice: As Issei's body breaks down from the poison and wounds, he sees Shalba about to kill his friends. He pushes his power to the absolute limit and uses his [Boosted Gear] ability to "Transfer" his new [Cardinal Crimson] armor's power to Rias, saving her. He then launches a final, sacrificial attack on Shalba, seemingly being "erased" or "killed" in the process. The volume ends with Issei being declared "dead" or "missing in action."

   3. Key Lore & Concepts

   • [Cardinal Crimson Promotion]: Issei's true and complete Balance Breaker evolution, manifested as his ultimate "Queen" form.
   • [Dragon Slayer]: A category of magical swords specifically designed to be lethal to dragons. This is a critical weakness for Issei, whose power comes from Ddraig.
   • Samael: A "Dragon-Eater" or "Poison of God." A being whose very existence is pure poison to dragons and gods, making it Issei's ultimate counter.

   ---

   Volume 12: Heroic Oppai Dragon

   (AKA: The Hero of the Oppai Dragon)

   1. Key Characters

   • Great Red: The "True Dragon," or "Dragon of Dragons." A being of pure power and dreams who "swims" in the Dimensional Gap.
   • Lilith: A new entity created from a part of Ophis's power that she shed.
   • Rias Gremory: In a state of deep depression and grief over Issei's "death."

   2. Core Plot Summary

   • The Aftermath: Rias and the ORC are shattered by Issei's death. Rias has locked herself away, and the team is in mourning.
   • Issei in the Gap: Issei is not dead. His "soul" (tethered to his Evil Pieces) was blasted into the Dimensional Gap. His physical body was completely destroyed by Samael's poison.
   • A New Body: In the Gap, Issei meets the two most powerful dragons: Ophis (the Infinite Dragon God) and Great Red (the True Dragon God). Using Issei's Evil Pieces as a base, they "rebuild" him a new body using the actual flesh of the Great Red.
   • The Return: A magical beast created by a "fake" Diodora appears in the Underworld, targeting the grieving Rias. Just as Rias is about to be killed, a portal opens. Issei returns, now in his new, more powerful dragon-based body.
   • The "Oppai Dragon" Show: A new threat emerges: Lilith, the "other" Ophis, has created a massive, rampaging golem. The only thing that can calm this powerful, childlike being is... a TV show. Issei, Azazel, and the Faction leaders are forced to create an absurd children's show called "Heroic Oppai Dragon," starring Issei. The show is broadcast worldwide, and its theme song (sung by Issei) successfully calms Lilith.

   3. Key Lore & Concepts

   • Issei's New Body: Issei is no longer human. His new body is made from the flesh of the Great Red, making him a unique Dragon-Devil hybrid, free from his original human-life limitations.
   • Great Red: The single most powerful being in the Dimensional Gap, and a non-sentient (or at least, non-communicative) force of nature.
   • The "Oppai Dragon" Title: Issei is now internationally famous, not as a warrior, but as the "Oppai Dragon," a beloved children's hero. This becomes his official moniker.
7. #7Vol 13~16

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 13-16

   Volume 13: Issei's Big Comeback

   (AKA: Issei Goes to Work)

   1. Key Characters

   • Occult Research Club (ORC): The full team, now dealing with Issei's new fame as the "Oppai Dragon."
   • Ravel Phoenix: Riser Phoenix's younger sister (his "Bishop"). She is a strategic genius.
   • Tannin: The former Dragon King and Issei's training mentor.

   2. Core Plot Summary

   • A New Home: The Gremory peerage moves into a new, massive mansion built on the school grounds, funded by Rias's father, Zeoticus.
   • Issei's New Manager: Ravel Phoenix transfers to Kuoh Academy and, under Rias's request, becomes Issei's official "Manager." She is tasked with helping him handle his fame and training him in battle strategy, as he is notoriously bad at it.
   • Training with Ravel: Ravel begins tutoring Issei in tactics, strategy, and even "King" leadership, preparing him for the day he will lead his own peerage. She also helps him manage his new "Oppai Dragon" persona.
   • A New Threat: A new antagonist, Euclid Lucifuge (Grayfia's brother), appears. He is allied with the Khaos Brigade and is searching for a powerful weapon.
   • Stray Devil Incident: The ORC, with Ravel as their command-and-control strategist, takes on a professional Devil Job to hunt a new, powerful Stray Devil. The mission demonstrates Issei's growth as a leader and Ravel's competence as a manager.

   3. Key Lore & Concepts

   • Ravel's Role: Ravel officially joins Issei's "inner circle." She is not part of his harem, but serves as his primary strategist and manager.
   • Issei's Future Peerage: This volume plants the first serious seeds of Issei becoming a "King" and gathering his own peerage, with Ravel being the first (unofficial) member.
   • Euclid Lucifuge: A new, high-ranking member of the Khaos Brigade, connected to the Old Satan Faction.

   ---

   Volume 14: Wizards of the Student Council

   (AKA: The Wizard of the Red (Crimson) Path)

   1. Key Characters

   • Sona Sitri & Sitri Peerage: This volume is a "side story" focusing heavily on Sona's team, particularly her "Pawn," Saji Genshirou.
   • Magical Girls (Unofficial): The Sitri peerage (Sona, Tsubaki, Tsubasa, etc.) are forced to adopt "Magical Girl" personas to fight a new enemy.
   • Bivam: A new enemy from a rival Devil faction.

   2. Core Plot Summary

   • A Side Story: This volume runs parallel to Volume 13. While Issei and the ORC are on their mission, the Sitri peerage takes center stage.
   • The "Magical Girl" Problem: Sona Sitri and her peerage are forced into a battle where they must wear "Magical Girl" (Mahou Shoujo) outfits, created by Sona's magical-girl-obsessed sister, Serafall Leviathan.
   • Saji's Development: Saji Genshirou, Issei's rival, gets a significant amount of focus. He demonstrates his growth and the versatility of his Vritra Sacred Gear's abilities, particularly its "Absorption Line."
   • Teamwork: The core of the volume is a showcase of the Sitri peerage's incredible teamwork and strategic prowess, contrasting them with the Gremory team's reliance on raw power. They work together to defeat a high-level threat, proving their own strength.

   3. Key Lore & Concepts

   • Magical Girl Contract: Serafall Leviathan (one of the Four Great Satans) is revealed to have her own "Magical Girl" TV show and attempts to force her sister Sona into it.
   • Sitri Peerage Tactics: Unlike Rias's team, Sona's team is shown to be a well-oiled machine, relying on perfect coordination, planning, and combined arms rather than individual power.

   ---

   Volume 15: The Dark Knight

   (AKA: The Dark Knight of the Sunny Spot)

   1. Key Characters

   • Kiba Yuuto: The volume's main protagonist, focusing on his past and future.
   • Kiba's Old Comrades: Spirits and remnants from his past as a survivor of the "Holy Sword Project."
   • Siegfried: The "Chaos-Edge" Holy-Demonic Sword user from the Hero Faction, and Kiba's primary rival.

   2. Core Plot Summary

   • A Side Story (Kiba's Arc): This volume is another side story, this time focusing entirely on Kiba Yuuto.
   • The Past Haunts: Kiba is confronted by the lingering spirits and regrets of his dead friends from the Holy Sword Project. He is also targeted by enemies seeking his [Sword of Betrayer].
   • Kiba vs. Siegfried: Kiba has a fated rematch with Siegfried. This battle tests Kiba's resolve and his mastery over his Sacred Gear.
   • New Power: Kiba achieves a new level of power by finally making peace with his past. He accepts the spirits of his fallen comrades, who "join" with him, and forges a new, ultimate Holy-Demonic Sword, [Gram], also known as the "Sword of the Demon Emperor."
   • Conclusion: Kiba defeats Siegfried, finds closure for his past, and solidifies his place as one of the Gremory peerage's top fighters, the "Strongest Knight."

   3. Key Lore & Concepts

   • [Gram]: Kiba's new, ultimate sword, a "Demonic Sword of Light and Darkness." It is the pinnacle of his Holy-Demonic fusion.
   • Kiba's Character Arc: This volume completes Kiba's primary character arc, moving him from a person driven by revenge and haunted by the past to a warrior who fights for his new friends and future.

   ---

   Volume 16: Daywalker of the Extracurricular Lesson

   (AKA: The Daywalker's Extracurricular Lesson)

   1. Key Characters

   • Gasper Vladi: The volume's main protagonist, focusing on his growth.
   • Valerie Tepes: A member of the "Vampire Faction" and the wielder of the Longinus [Sephiroth Graal] (the Holy Grail).
   • Marius Tepes: A member of the Vampire nobility (Valerie's brother) who is allied with the Khaos Brigade.
   • Rias and Issei: Travel to Romania as "support" for Gasper.

   2. Core Plot Summary

   • A Side Story (Gasper's Arc): This volume is the third "side story," focusing on Gasper.
   • The Vampire Civil War: The Gremory team travels to Romania, Gasper's homeland, during a vampire civil war. One faction (led by Marius Tepes) has allied with the KhaVampireos Brigade.
   • Gasper's Power: Gasper is forced to confront his past and his "Daywalker" (Dhampir) heritage. His time-stopping power, [Forbidden Balor View], is revealed to be a "sub-species" or mutated form of a more powerful Longinus.
   • The Holy Grail: The true objective of the Khaos Brigade is revealed: to capture Valerie Tepes and her Longinus, the [Sephiroth Graal]. This Holy Grail has the power to resurrect the dead, including gods.
   • Gasper's Evolution: To protect his friends and his new ally (Valerie), Gasper faces his fears and unlocks a new, powerful form. He creates an "avatar" of darkness and fog, a being of "forbidden" time and darkness, allowing him to fight on the front lines.
   • Climax: Issei and Rias support Gasper as he takes the lead, defeating the enemy vampires and rescuing Valerie. Gasper finally gains confidence in himself and his abilities.

   3. Key Lore & Concepts

   • Vampire Faction (Tepes & Carmilla): The vampires are introduced as a major new faction, split into two warring houses (Tepes and Carmilla).
   • [Sephiroth Graal] (Holy Grail): A top-tier Longinus with the power to resurrect gods or create other catastrophic effects. It is a major target for the Khaos Brigade.
   • Gasper's Growth: This volume completes Gasper's arc from a timid shut-in to a confident (if still shy) and incredibly powerful member of the team.
8. #8Vol 17~19

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 17-19

   Volume 17: King of the School Trip

   (AKA: The King of the Extracurricular Lesson)

   1. Key Characters

   • Issei Hyodo: Now recognized as a "King" (in status) and a hero.
   • Aika Kiryuu: Issei's perverted human female friend, who is revealed to know about the supernatural world.
   • Cao Cao & Hero Faction: The antagonists, launching their final, desperate attack.
   • Siegfried: Kiba's rival, who returns for a final duel.

   2. Core Plot Summary

   • Issei's New Team: Issei begins the process of building his own "team" for his future peerage, with Ravel as his manager and the ORC girls (Asia, Xenovia, Koneko) as his (unofficial) core.
   • Hero Faction's Last Stand: The Hero Faction launches a major terrorist attack on Issei's hometown, targeting his human friends and family to draw him out.
   • The Final Duels: Kiba faces Siegfried in a conclusive battle, while Issei confronts Cao Cao.
   • Issei's New Form (DxD G): Issei's human friends are put in mortal danger. His desire to protect them, combined with Ophis's power (from his new body), allows him to unlock a new, "pseudo" form called [Diabolos Dragon (DxD) G(uardian)]. This form is a "God-Slayer" state, powerful enough to counter Cao Cao's [True Longinus].
   • Cao Cao's Defeat: Issei, using his new DxD G form, defeats Cao Cao. The Hero Faction is dismantled, with its leaders (Cao Cao, Siegfried, Jeanne, Heracles) being captured or fleeing.
   • Aika's Revelation: Issei's friend, Aika Kiryuu, reveals she has the "ability" to see the "stats" and "data" of supernatural beings, which is why she knew Issei was connected to the "Oppai Dragon."

   3. Key Lore & Concepts

   • [Diabolos Dragon (DxD)]: Issei's unique, ultimate form that surpasses [Cardinal Crimson]. It's a "God" (in power level) form created by combining Issei's dragon power with Ophis's "Infinite" power. The "G" in this volume stands for "Guardian," a temporary form activated by his desire to protect his human friends.
   • End of the Hero Faction: This volume concludes the main storyline involving Cao Cao's Hero Faction as a primary threat.

   ---

   Volume 18: The Vampire's Visit

   (AKA: The Vampire and the Holy Grail)

   1. Key Characters

   • Rizevim Livan Lucifer: The true main antagonist. He is the son of the original Lucifer, Vali's grandfather, and the leader of the "Evil Devils." He is "evil for the sake of evil."
   • Elmenhilde Karnstein: A beautiful, high-class vampire from the "Carmilla" faction. She comes to Japan seeking Gasper.
   • Valerie Tepes: The wielder of the [Sephiroth Graal] (Holy Grail), who is staying with the Gremory group.
   • Gasper Vladi: Elmenhilde's arrival puts him in the spotlight.

   2. Core Plot Summary

   • Elmenhilde's Arrival: The vampire noble Elmenhilde arrives at Issei's home. She is interested in Gasper, both for his rare "Daywalker" (Dhampir) status and his immense power.
   • The True Villain Appears: The peace is shattered by the sudden appearance of Rizevim Livan Lucifer.
   • Overwhelming Power: Rizevim demonstrates his terrifying power by casually defeating the combined Gremory and Vali teams. He possesses the Sacred Gear [Sacred Gear Canceller], allowing him to nullify their powers.
   • The Holy Grail is Stolen: Rizevim's true goal is revealed: he kidnaps Valerie Tepes and steals the [Sephiroth Graal] (Holy Grail) from her.
   • A New Threat: Rizevim escapes with the Holy Grail, announcing his plan to use it to resurrect the evil "Beasts" from the past (like the dragon "Apophis") and bring chaos to all factions.

   3. Key Lore & Concepts

   • Rizevim Livan Lucifer: The true mastermind behind the Khaos Brigade. He is an ancient "Super-Devil" with immense power and a sadistic, chaotic personality.
   • [Sacred Gear Canceller]: Rizevim's unique ability (a mutated Longinus) that can deactivate any Sacred Gear, making him the ultimate counter to Issei, Vali, and most other powerful wielders.
   • The Stakes are Raised: The plot moves from fighting terrorists (Hero Faction) to confronting the "Devil" who started it all, who now possesses the god-resurrecting Holy Grail.

   ---

   Volume 19: The Nekomata's New Path

   (AKA: The Nekomata and the Azazel Cup)

   1. Key Characters

   • Koneko Toujou (Shirone): The volume's main protagonist, focusing on her relationship with her sister.
   • Kuroka: Koneko's older sister, a member of the Vali Team.
   • Issei & Rias: Preparing for a new challenge.
   • Sona Sitri & Saji Genshirou: Also preparing for the tournament.

   2. Core Plot Summary

   • The Azazel Cup: Azazel announces a new, international Rating Game tournament: the "Azazel Cup." This tournament is open to all factions, gods, and mythological beings, with the goal of finding the "strongest" in the new world of peace.
   • Team Gremory vs. Team Sitri: Rias and Sona's teams both enter the tournament, setting them on a path to eventually face each other.
   • Koneko's Dilemma: The B-plot focuses on Koneko. Her sister, Kuroka, is aggressively trying to seduce Issei, believing he is the perfect mate to help her "repopulate" the Nekoshou race.
   • [Shirone Mode]: This conflict forces Koneko to confront her own "Nekoshou" nature, which she had previously suppressed. Issei helps her, and she finally accepts her heritage, unlocking a new, adult-like form: [Shirone Mode] (or "White Cat Form"). In this form, she can safely use her race's powerful Senjutsu and Youjutsu.
   • Conclusion: Koneko and Kuroka reconcile. The Gremory Team begins its training for the Azazel Cup, ready for their first match.

   3. Key Lore & Concepts

   • Azazel Cup: A new, global Rating Game tournament that becomes the focus of the next major story arc. It's a "World Cup" for supernatural beings.
   • [Shirone Mode]: Koneko's new power-up. She temporarily transforms into an adult version of herself, gaining full access to her "Senjutsu" (Sage arts) and "Youjutsu" (Magic arts) abilities.
   • Nekoshou's Goal: The Nekoshou (cat-person) race's desire to "breed" with powerful individuals like Issei is established as a recurring plot point.
9. #9Vol 20~22

   Keys:

   Enabled · Order 100

   Entry settings

   📖 High School DxD Lorebook: Volume 20-22

   Volume 20: Ddraig of the Future

   (AKA: The Red Dragon Emperor of the Future)

   1. Key Characters

   • Rizevim Livan Lucifer: The main antagonist, continuing his rampage.
   • Apophis: An ancient, evil Dragon God (an "Evil Dragon") who is resurrected by Rizevim using the Holy Grail.
   • Aži Dahāka: Another immensely powerful, three-headed Evil Dragon resurrected by Rizevim.
   • Issei Hyodo (Future): An Issei from an alternate future timeline who appears to warn the present-day group.
   • ORC Children (Future): Several children of the current ORC members also arrive from the future, including Ira (Issei & Akeno's son) and Kurenai (Issei & Rias's son).

   2. Core Plot Summary

   • Rizevim's Attack: Rizevim, allied with Apophis and Aži Dahāka, launches a full-scale invasion of the Underworld. Their goal is to destroy the Devil government and release the ultimate "Beast," Trihexa (666).
   • The Future Guests: During the chaos, a group of "future children" of the ORC members, led by a future version of Issei, travel to the past (the present) to help. They reveal they are from a timeline where Rizevim won and unleashed Trihexa, destroying the world.
   • Issei's True [DxD]: The "Future Issei" is revealed to be the true form of the [Diabolos Dragon (DxD)]. Issei (present) learns that his DxD G form was just a temporary, specialized version.
   • Battle Against Evil Dragons: The combined forces of the present-day heroes and their future children fight the invading Evil Dragons.
   • Issei's New Power-Up: Issei, inspired by his future self, unlocks the ability to use his [DxD] form, but only partially. He gains dragon wings and access to Ophis's "Infinite" power.
   • Rizevim's Capture: Rizevim is eventually cornered and captured by the combined forces, but not before he successfully "unseals" Trihexa.

   3. Key Lore & Concepts

   • Trihexa (666): The "Apocalyptic Beast" from the Book of Revelation. It is the single most powerful and dangerous being in existence, sealed away in "Agreas." Rizevim's entire plan was to unseal it.
   • Evil Dragons: A faction of ancient, malevolent dragons (like Apophis) who are powerful enough to be considered "Dragon Gods."
   • [Diabolos Dragon (DxD)] (True Form): Issei's ultimate form, which is a perfect fusion of his [Boosted Gear] power and Ophis's "Infinite" power, effectively making him a "Dragon God."
   • Alternate Future: The introduction of a "dark" future timeline where the heroes failed.

   ---

   Volume 21: Lucifer of the Final Battle

   (AKA: Lucifer of the Final War)

   1. Key Characters

   • Trihexa (666): The Apocalyptic Beast. Its "core" is a massive, rampaging monster, and it also creates countless smaller "cores" of itself.
   • Rizevim Livan Lucifer: Escapes from prison and continues to be the main antagonist.
   • Fafnir: A "Dragon King" and Asia's guardian, who appears in his true dragon form.
   • Vali Lucifer: Plays a key role in the final confrontation with his grandfather, Rizevim.
   • Issei Hyodo: Leads the charge against Trihexa's main body.

   2. Core Plot Summary

   • Trihexa is Unleashed: Trihexa is fully unsealed and begins its rampage. The "main core" is a colossal beast, but it also spawns countless smaller (but still immensely powerful) copies that attack all mythologies at once.
   • The "Final War": Every faction (Devils, Angels, Fallen Angels, Gods from all mythologies like Odin, Zeus, etc.) forms a grand alliance to fight Trihexa's main body and its copies.
   • Vali vs. Rizevim: Vali finally confronts his grandfather, Rizevim. Rizevim, who has lost his [Sacred Gear Canceller], is finally killed by Vali, ending the threat of the Old Satan Faction leader.
   • Issei's True [DxD]: Issei, seeing the world in peril, finally achieves his true [Diabolos Dragon (DxD)] form. He transforms into a "True Dragon" (like Ddraig or Albion), becoming a being of pure, infinite power.
   • Issei & Vali vs. Trihexa: Issei (in his true Dragon form) and Vali (in his ultimate [Empireo Juggernaut Overdrive] form) team up to fight Trihexa's main body. They manage to push it back, but cannot destroy it.
   • The Sealing: The heroes realize Trihexa is too powerful to be "killed." The plan changes to "sealing" it.

   3. Key Lore & Concepts

   • [Diabolos Dragon (DxD)] (True Dragon Form): Issei's ultimate evolution. He is no longer "wearing" armor; he becomes a True Dragon, on the same level as Ddraig and Albion.
   • [Empireo Juggernaut Overdrive]: Vali's own ultimate form, a stable and "pure" version of the Juggernaut Drive, fusing his Lucifer (Devil) power with his Albion (Dragon) power.
   • The Grand Alliance: The final battle unites every mythological pantheon in the DxD universe against a single, common enemy.

   ---

   Volume 22: Gremory of the Future

   (AKA: Gremory of the Final Battle)

   1. Key Characters

   • Issei Hyodo: The main hero, leading the sealing operation.
   • Great Red: The "True Dragon God" who lives in the Dimensional Gap.
   • The "Sealing Team": A team of heroes who volunteer for a one-way trip to seal Trihexa.
   • Rias Gremory: Faces her graduation and the future of her relationship with Issei.

   2. Core Plot Summary

   • The Sealing Plan: The plan is to push Trihexa's main body into the Dimensional Gap and seal it in an isolated dimension, but it requires a constant "guard" to keep it sealed.
   • Issei's Sacrifice: Issei, in his true DxD form, volunteers to be the one to push Trihexa into the Gap and stay there to fight and seal it—a seemingly one-way trip.
   • The World's Hero: The "Oppai Dragon" song is broadcast across all factions to give Issei the "power" (emotional support) to complete his mission. He successfully pushes Trihexa into the isolated sealing field.
   • Issei's "Death" (Again): Issei is declared "Missing in Action" a second time, having sacrificed himself to save the world.
   • The Return: Issei is not dead. He is rescued from the Dimensional Gap by the Great Red (the True Dragon God).
   • Rias's Graduation: After the battle, life returns to normal. Rias Gremory graduates from high school.
   • The Engagement: During her graduation party, Rias's family pressures her to get married. Issei, having returned, interrupts the party (similar to how he interrupted Riser's in Volume 2). He officially proposes to Rias, as well as to Asia, Akeno, and all the other girls in his "harem."
   • Issei's Promotion: For saving the world, Issei is promoted to High-Class Devil. Rias, now his fiancée, "gives" her peerage (including Kiba, Koneko, etc.) to Issei, making him their new "King."

   3. Key Lore & Concepts

   • Issei's Final Promotion: Issei achieves his goal and becomes a High-Class Devil.
   • Issei's Peerage: Issei officially becomes a "King" and takes command of the entire Gremory peerage, which is now his peerage.
   • The Harem Ending: The volume concludes the "first" part of the High School DxD story by having Issei officially propose to his entire harem, solidifying their future. This volume serves as the finale for the original series.
10. #10Vol 23~25

    Keys:

    Enabled · Order 100

    Entry settings

    📖 High School DxD Lorebook: Volume 23-25

    Volume 23: The King's Game

    (AKA: The King of the Azazel Cup)

    1. Key Characters

    • Issei Hyodo: Now a High-Class Devil, he must act as a "King" and form his own team.
    • Rias Gremory: Also forms her own team to compete.
    • The "Harem": Issei proposes to Irina and Rossweisse, officially adding them to his list of fiancées.
    • Sairaorg Bael: Also a participant in the tournament.

    2. Core Plot Summary

    • A New Tournament, A New Rivalry: The Azazel Cup (the international Rating Game tournament) is the main focus. As new High-Class Devils, both Issei and Rias must enter as "Kings" of their own teams.
    • Team [Hyoudou Issei]: Issei forms his official team. Rias "loans" him Asia, Xenovia, and Gasper. He also recruits Irina, Ravel Phoenix (as his strategist/Bishop), and Rossweisse (as his Rook).
    • Team [Rias Gremory]: Rias forms her own team to compete directly against Issei, seeing him as her ultimate rival. Her team consists of her original pieces: Kiba Yuuto, Koneko Toujou, and Akeno Himejima.
    • Proposals: This volume is a major relationship milestone. Issei officially proposes marriage to Irina Shidou and Rossweisse, both of whom accept. This solidifies their place alongside Rias, Akeno, and Asia.
    • Training and Preparation: The rest of the volume focuses on both teams training for the tournament, developing new strategies, and preparing for their first matches.

    3. Key Lore & Concepts

    • The "Issei vs. Rias" Dynamic: The main couple is now officially set to be rivals in the tournament, creating a new personal and professional dynamic.
    • Issei's Team (Official): This volume formally creates "Team [Hyoudou Issei]," which becomes his main peerage/team for the rest of the series.

    ---

    Volume 24: The Grim Reaper's Test

    (AKA: The Grim Reaper of the Off-Campus Learning)

    1. Key Characters

    • Hades: The God of the Greek Underworld (Helheim), who becomes a major antagonist.
    • Thanatos: The Greek God of Death (a Grim Reaper) and Hades's top subordinate.
    • Rias Gremory & Team [Rias Gremory]: This is Rias's team's time to shine.
    • Vali Lucifer & Team [Vali]: Rias's first opponent in the tournament.

    2. Core Plot Summary

    • The First Match: Rias vs. Vali: The Azazel Cup begins. Rias's team's first match is against the incredibly powerful "Team [Vali]."
    • A New Threat: As the match is about to begin, the arena is attacked by a massive army of Grim Reapers, led by Thanatos.
    • Hades's Plot: This attack is a distraction. The real goal, orchestrated by Hades, is to use the chaos to resurrect the remaining "Evil Dragons" (clones of Trihexa/666) that were sealed.
    • Issei vs. Thanatos: While Rias's team engages Vali's team (who are also fighting the reapers), Issei is drawn into a separate battle against Thanatos himself, defending the spectators and the stadium.
    • Conclusion: The match is postponed due to the attack. The heroes realize that Hades and his alliance with the "Evil Dragons" are the new primary threat, even as the tournament continues.

    3. Key Lore & Concepts

    • Hades as Antagonist: The God of the Greek Underworld is confirmed as a major villain, seeking to disrupt the peace and unleash chaos.
    • The "Evil Dragon" Army: The leftover clones of Trihexa are now being systematically unsealed by Hades to be used as his army.

    ---

    Volume 25: Yggdrasil of the Summer Courses

    (AKA: Yggdrasil and the Final Battle)

    1. Key Characters

    • Issei Hyodo & Team [Hyoudou Issei]: Their first official match.
    • Tobio Ikuse: The "Hero" wielder of the Longinus [Canis Lykaon], and Issei's first opponent.
    • Vidar: The Norse God, son of Odin.
    • Hades & Evil Dragons: The main antagonists, launching their final assault.

    2. Core Plot Summary

    • Issei's First Match: Team [Hyoudou Issei] has its first tournament match against Team [Slash Dog] (led by Tobio Ikuse). Issei's team wins.
    • Rossweisse's Marriage Meeting: A side-plot involves Rossweisse being forced into an arranged marriage (omiai) with the Norse God Vidar. Issei and the team intervene.
    • Hades's Final Attack: The main plot resumes. Hades and his massive army of Evil Dragons (including Apophis) launch a full-scale invasion of the Norse realm, targeting Yggdrasil, the World Tree, to destroy the entire mythological system.
    • The Battle at Yggdrasil: A final, massive battle erupts. Issei, Rias, Vali, and all their allies team up with the Norse Gods (Odin, Vidar, etc.) to defend Yggdrasil.
    • Issei vs. Apophis: Issei, using his true [Diabolos Dragon (DxD)] form, has a final showdown with Apophis, the most powerful Evil Dragon.
    • Finale: The heroes successfully defeat Hades's army and Apophis, securing the world's safety. The Azazel Cup is postponed.
    • Conclusion: The volume ends with Issei and Rias confirming their love and looking toward their future. This volume serves as the finale of the original High School DxD, concluding the main story arc.

    3. Key Lore & Concepts

    • End of High School DxD: This volume is the official end of the first series. The story continues directly in the sequel, Shin High School DxD.
    • Yggdrasil: The World Tree is confirmed to be a real, tangible object that connects all the mythological realms.
    • Gasper's Longinus: Gasper's Sacred Gear, [Forbidden Balor View], is officially reclassified as one of the 13 Longinus.
11. #11용어

    Keys:

    Always on · Order 100

    Entry settings

    📖 High School DxD: Key Terms Lorebook

    1. Core Systems & Items

    • Sacred Gear

      • Definition: Powerful tools (神器) bestowed upon humans by the God of the Bible. They awaken based on the user's potential and grant various supernatural abilities.
      • Features: Most Sacred Gears reside only in humans. When the host dies, the Gear moves to a new host. If the host is reincarnated as a Devil or Angel, they can keep their Sacred Gear.

    • Longinus

      • Definition: The name for the 13 top-tier Sacred Gears. They are irregular items with the potential to kill Gods.
      • Examples: [Boosted Gear], [Divine Dividing], [True Longinus], [Twilight Healing].

    • Evil Pieces

      • Definition: Tools used by high-class Devils to create their "Peerage" (servants). They are based on chess pieces (1 Queen, 2 Rooks, 2 Knights, 2 Bishops, 8 Pawns). The 'King' piece is not given.
      • Function: Used to reincarnate other beings (humans, yokai, etc.) into Devils. The reincarnated being becomes a servant in the 'King's' peerage, gaining power from them. 'Pawns' have the special ability of 'Promotion'.

    • Balance Breaker

      • Definition: The "Forbidden" or "Sub-Species" form and ultimate awakening of a Sacred Gear. It is the released state of a Gear's full potential, based on the user's will and power.
      • Features: Most take the form of powerful armor (e.g., Issei's [Boosted Gear Scale Mail]) and consume an immense amount of demonic power.

    • Juggernaut Drive

      • Definition: A berserk form unique to the two Heavenly Dragon Sacred Gears (Red Dragon and White Dragon). It is an incomplete awakening of Balance Breaker.
      • Features: It uses the user's own life force as fuel to unleash destructive power. It is triggered by extreme negative emotions (rage, sorrow) and causes the user to lose their sanity and rampage.

    2. Factions & Organizations

    • The Three Factions

      • Definition: The Devils, Angels, and Fallen Angels. They fought a great war in antiquity but are currently in a fragile truce under a 'Peace Treaty'.
      • Features: The God of the Bible and the original Four Great Satans all died during the great war.

    • Devils

      • Definition: Residents of the Underworld, ruled by the current Four Great Satans (e.g., Sirzechs Lucifer, Ajuka Beelzebub) and the 72 Pillar noble families.
      • Culture: They determine rank and honor through 'Rating Games' and expand their influence by using 'Evil Pieces' to increase their peerages.

    • Fallen Angels

      • Definition: Angels who fell from Heaven. Their former Governor-General was Azazel, who leads the organization 'Grigori'.
      • Features: They are the most fervent researchers of Sacred Gears and possess advanced technology.

    • Khaos Brigade

      • Definition: A massive terrorist organization that opposes the current peace of the Three Factions. Founded by the Ouroboros Dragon, Ophis.
      • Composition: A coalition of various groups, including the Old Satan Faction, the Hero Faction, and the Vali Team.

    • Occult Research Club (ORC)

      • Definition: The Kuoh Academy club used as a cover by Rias Gremory's peerage. It is the central base of operations for the story.

    3. Concepts & Beings

    • Rating Game

      • Definition: The official sport and ranking matches of Devil society. A 'King' and their peerage fight as a team in a chess-like simulation battle.
      • Purpose: Resolving disputes between Devils, improving social standing, and entertainment.

    • Promotion

      • Definition: A special trait of the 'Pawn' Evil Piece. Under certain conditions (usually by reaching enemy territory), a Pawn can temporarily 'Promote' to a Queen, Rook, Knight, or Bishop. This is Issei's key tactic.

    • Stray Devil

      • Definition: A reincarnated Devil who has betrayed and fled from their 'King', or one who has lost their master and gone berserk with power.
      • Status: They are a public enemy to all Three Factions and are designated for termination on sight.

    • Two Heavenly Dragons

      • Definition: The Red Dragon Emperor, 'Ddraig', and the White Dragon Emperor, 'Albion'. The two strongest dragons, whose souls are sealed in Sacred Gears.
      • Destiny: They are eternal rivals who have always fought each other. They are sealed in the [Boosted Gear] (Issei) and [Divine Dividing] (Vali), respectively.

    • Ophis & Great Red

      • Definition: The two strongest 'Dragon' beings in the entire worldview.
      • Ophis: The 'Ouroboros Dragon' (Dragon God of Infinity). The founder of the Khaos Brigade. She seeks 'Silence'.
      • Great Red: The 'True Red Dragon God Emperor' (True Dragon). A colossal dragon that swims through the Dimensional Gap. The embodiment of 'Dreams'.
12. #12그레이트 레드

    Keys: グレート, レッド, 그레이트 레드, Great Red, 적룡신제

    Enabled · Order 100

    Entry settings

    Great Red

    • Affiliation: None (Dimensional Gap)
    • Existence: The True Red Dragon God Emperor. The "Dragon of Dreams" (D×D).
    • Core: A being on par with, or even surpassing, Ophis as the strongest in the world. An impossibly large red dragon that swims eternally through the Dimensional Gap. He is known to enjoy watching Issei's "Oppai Dragon" show.
    • Lore Keywords: #TopTier #TrueDragon #Dreams #DimensionalGap #Colossal
13. #13오피스

    Keys: オーフィス, 오피스, Ophis, Ouroboros, 우로보로스, 무한

    Enabled · Order 100

    Entry settings

    Ophis

    • Affiliation: Khaos Brigade (Founder / Former Leader)
    • Existence: The Ouroboros Dragon. A being of "Infinity" and "Nothingness."
    • Core: One of the strongest beings in the world. Has an androgynous appearance, typically taking the form of a loli girl. She acts solely for the purpose of returning to the Dimensional Gap to regain "Silence." She shows almost no emotion.
    • Lore Keywords: #TopTier #DragonGod #Infinity #Ouroboros #Silence #Loli
14. #14사이라오그 바알

    Keys: サイラオーグ, バアル, 사이라오그, 바알, Sairaorg, Bael

    Enabled · Order 100

    Entry settings

    Sairaorg Bael

    • Affiliation: Bael Clan (Heir)
    • Ability: Lacks the [Power of Destruction]; instead, he has perfected his body through pure physical training to achieve transcendent power.
    • Core: Issei's other major rival. Born into the noble Bael family but despised for lacking demonic power. He overcame everything with pure physical might and hard work. He is an "Emperor" who seeks a fair and honorable fight.
    • Lore Keywords: #Rival #PhysicalProwess #HardWork #Emperor #BaelClan #Honorable
15. #15아자젤

    Keys: アザゼル, 아자젤, Azazel, 타천사, Fallen Angels

    Enabled · Order 100

    Entry settings

    Azazel

    • Affiliation: Grigori (Fallen Angels) (Former Governor-General) -> ORC Advisor
    • Ability: Artificial Sacred Gear creation, high-level research, Light Spears
    • Core: The former leader of the Fallen Angels, who stepped down to promote peace. He is an obsessive researcher of Sacred Gears. He acts as a mentor and advisor to Issei, providing advice and equipment.
    • Lore Keywords: #Mentor #FallenAngel #GovernorGeneral #SacredGearOtaku #OldMan #Ally
16. #16바리 루시퍼

    Keys: ヴァーリ, ルシファー, 바리, 루시퍼, 백룡황, Vali, Lucifer

    Enabled · Order 100

    Entry settings

    Vali Lucifer

    • Affiliation: Vali Team (Khaos Brigade)
    • Sacred Gear: [Divine Dividing] (Albion, the White Dragon Emperor)
    • Core: Issei's fated rival. A half-Devil/half-human descendant of the original Lucifer. He is a battle maniac obsessed with fighting strong opponents. He is the "White Dragon Emperor" to Issei's "Red Dragon Emperor."
    • Lore Keywords: #Rival #WhiteDragonEmperor #LuciferBloodline #BattleManiac
17. #17레이벨 피닉스

    Keys: レイヴェル, フェニックス, 레이벨, 피닉스, Ravel, Phoenix

    Enabled · Order 100

    Entry settings

    Ravel Phoenix

    • Affiliation: Phoenix Clan -> Issei's Team Manager (Rank: Bishop)
    • Ability: Phoenix Immortality (Regeneration), Fire Magic, Master Strategist
    • Core: Riser Phoenix's younger sister. She fell in love with Issei and appointed herself as his manager and strategist. She is the "brains" of Issei's team. A classic Tsundere.
    • Lore Keywords: #Manager #Strategist #Phoenix #Immortal #Tsundere
18. #18로스바이세

    Keys: ロスヴァイセ, 로스바이세, Rossweisse, Valkyrie

    Enabled · Order 100

    Entry settings

    Rossweisse

    • Affiliation: Gremory Peerage (Rank: Rook)
    • Ability: Norse Magic (Runes)
    • Core: A former Valkyrie (Odin's bodyguard). She was abandoned by Odin and became a Devil under Rias. She is obsessed with 100-yen shops (dollar stores) and is desperate to get a boyfriend.
    • Lore Keywords: #Rook #Valkyrie #NorseMagic #100YenShop #Single
19. #19개스퍼 블라디

    Keys: ギャスパー, ヴラディ, 개스퍼, 블라디, Gasper, Vladi

    Enabled · Order 100

    Entry settings

    Gasper Vladi

    • Affiliation: Gremory Peerage (Rank: Bishop)
    • Sacred Gear: [Forbidden Balor View] (Longinus)
    • Core: A half-human/half-vampire (Dhampir) crossdresser. He is extremely shy and a hikikomori (shut-in). He possesses a powerful Sacred Gear that can stop time, which he initially could not control.
    • Lore Keywords: #Bishop #Crossdresser #Hikikomori #Dhampir #TimeStop
20. #20제노비아 콰르타

    Keys: アーシア, アルジェント, 제노비아, 콰르타, Xenovia, Quarta, Durandal

    Enabled · Order 100

    Entry settings

    Xenovia Quarta

    • Affiliation: Gremory Peerage (Rank: Knight)
    • Ability: Holy Sword [Durandal]
    • Core: A former Church swordswoman. After learning that "God is dead," she lost her faith and was reincarnated as a Devil. She is a battle maniac and a "muscle-brain" who values power. She wants to have Issei's strong children.
    • Lore Keywords: #Knight #HolySwordswoman #Durandal #BattleManiac #MuscleBrain #GodIsDead
21. #21아시아 아르젠토

    Keys: アーシア, アルジェント, 아시아, 아르젠토, Asia, Argento, Nun, Heal

    Enabled · Order 100

    Entry settings

    Asia Argento

    • Affiliation: Gremory Peerage (Rank: Bishop)
    • Sacred Gear: [Twilight Healing] (Longinus)
    • Core: A former Nun. She was exiled as a heretic for healing a Devil and was killed by Fallen Angels, but was reincarnated as a Devil by Rias at Issei's request. She is extremely kind-hearted and innocent, serving as the peerage's primary healer.
    • Lore Keywords: #Bishop #Healer #Nun #Innocent #TwilightHealing #Heretic
22. #22토죠 코네코

    Keys: 塔城, 小猫, 토죠, 코네코, Koneko, Toujou, Neko, 고양이

    Enabled · Order 100

    Entry settings

    Koneko Toujou

    • Affiliation: Gremory Peerage (Rank: Rook)
    • Ability: Superhuman strength, defense, Senjutsu (Sage Arts)
    • Core: A quiet, emotionless loli character (Kuudere). Her true identity is a "Nekoshou" (cat yokai) named Shirone. She is the team's powerhouse and often responds to Issei's perversion with the comment, "How shameless."
    • Lore Keywords: #Rook #Loli #Kuudere #SuperhumanStrength #Nekoshou #Shameless
23. #23키바 유우토

    Keys: 木場, 祐斗, 키바, 유우토, Holy-Demonic Swords, 성마검, Kiba, Yuuto

    Enabled · Order 100

    Entry settings

    Kiba Yuuto

    • Affiliation: GGremory Peerage (Rank: Knight)
    • Sacred Gear: [Sword Birth], [Blade Blacksmith]
    • Core: The handsome swordsman of the ORC. The sole survivor of the "Holy Sword Project," he initially held a deep-seated revenge against Holy Swords. He is a master of [Holy-Demonic Swords].
    • Lore Keywords: #Knight #Swordsman #Handsome #HolySwordProject #Revenge #HolyDemonicSword
24. #24히메지마 아케노

    Keys: 姫島, 朱乃, 히메지마, 아케노, 타천사, Fallen, Angel, Akeno, Himejima, Azazel

    Enabled · Order 100

    Entry settings

    Akeno Himejima

    • Affiliation: Gremory Peerage (Rank: Queen)
    • Ability: [Holy Lightning], Elemental Magic
    • Core: Rias's second-in-command (Queen). The daughter of the Fallen Angel Cadre Baraqiel (half-Fallen Angel, half-human). She has a gentle "Ara ara~" (Oh my~) personality but reveals a sadistic (S) side in combat.
    • Lore Keywords: #Queen #AraAra #OneeSan #PriestessOfThunder #Sadist #HalfBlood
25. #25리아스 그레모리

    Keys: リアス, グレモリー, 리아스, 그레모리, Rias, Gremory, Clan

    Enabled · Order 100

    Entry settings

    Rias Gremory

    • Affiliation: Gremory Clan (Heir), Occult Research Club (Rank: King)
    • Ability: [Power of Destruction] (Gremory clan's unique demonic power)
    • Core: The main heroine. Issei's master and lover. A high-class Devil known as the "Crimson-Haired Ruin Princess." She is typically kind and tolerant, but shows deep jealousy regarding Issei.
    • Lore Keywords: #MainHeroine #King #Master #RuinPrincess #PowerOfDestruction #Jealousy
26. #26효도 잇세이

    Keys: 兵藤, 一誠, 효도, 잇세이, 적룡제, Issei, Hyodo, Ddraig, Red Dragon Emperor

    Enabled · Order 100

    Entry settings

    Issei Hyodo

    • Affiliation: Gremory Peerage (Rank: Pawn x8) -> Later becomes a "King"
    • Sacred Gear: [Boosted Gear] (Ddraig, the Red Dragon Emperor)
    • Core: The protagonist. A perverted boy whose dream is to be a "Harem King." He is extremely loyal and will risk his life for Rias and his comrades. He loves breasts (Oppai) and often uses this as a source of power.
    • Lore Keywords: #Protagonist #RedDragonEmperor #Pervert #OppaiDragon #HotBlooded #Loyalty
27. #27단편집 1

    Keys:

    Enabled · Order 100

    Entry settings

    Volume DX.1: Love Song to the Reincarnated Angel

    Volume Theme: This collection is most famous for its title story, which is a crucial prequel to the entire series. The other stories are light-hearted slice-of-life adventures.

    Key Story Highlights:

    • Love Song to the Reincarnated Angel: This is the most important story. It reveals that a young Issei, as a child, met Rias Gremory (in disguise). Rias had run away from home, depressed about her forced engagement to Riser Phoenix. A young Issei, not knowing who she was, "saved" her from her sadness and inspired her with his talk about a man protecting the woman he loves. This childhood encounter is why Rias first took an interest in Issei when he was targeted in Kuoh Town.
    • Asia's Devil Job: A comedic story detailing Asia's first, and comically disastrous, attempt at fulfilling a Devil's contract.
    • The Fun Gremory Family: A look into the daily life of Rias's family in the Underworld, focusing on her brother Sirzechs, his wife Grayfia, and their son Millicas.
28. #28단편집 2

    Keys:

    Enabled · Order 100

    Entry settings

    Volume DX.2: Worship☆The Dragon God Girl!

    Volume Theme: This volume's main story introduces a major change to the cast's daily life by adding a new, powerful roommate. It's a blend of high-stakes "babysitting" and comedy.

    Key Story Highlights:

    • Worship☆The Dragon God Girl!: The main plot. Ophis, the Ouroboros Dragon God, becomes fascinated by Issei (the "Oppai Dragon"). Wanting to understand his power and lifestyle, she simply... moves into the Hyodo Residence.
    • The New Roommate: This story chronicles the chaos of the ORC having to live with and "babysit" the most powerful (and emotionally clueless) being in the world, trying to keep her safe and, more importantly, secret. This is the origin of Ophis's long-term alliance with Issei.
    • Side Stories: Includes other comedic shorts, such as Koneko's day off and Akeno's personal challenges.
29. #29단편집 3

    Keys:

    Enabled · Order 100

    Entry settings

    Volume DX.3: Issei SOS

    Volume Theme: This volume is a deep dive into comedy, "what if" scenarios, and harem antics. The main story tests the heroines' bonds with Issei in a hilarious way.

    Key Story Highlights:

    • Issei SOS: The title story. Issei is hit by an enemy's ability that doesn't harm him physically, but instead reverts his personality to that of his lecherous, pre-reincarnation middle school self. He loses all his character development and respect for the girls, becoming a pure, unrestrained pervert. Rias and the others must find a way to "fix" him while dealing with his chaos.
    • Rias in Wonderland: A complete parody story that places Rias as the main character in a Alice in Wonderland-themed dream world, populated by DxD-versions of the characters (e.t., Issei as the "Oppai Dragon" Cheshire Cat).
    • The Unending Oppai: A short, comedic quest where Issei tries to scientifically (and perversely) determine the "perfect" breast.
30. #30단편집 4

    Keys:

    Enabled · Order 100

    Entry settings

    Volume DX.4: Student Council and the Underworld

    Volume Theme: This collection shifts the focus away from the ORC to give the Sitri Peerage (Sona's team) a chance in the spotlight, developing the rival team and their own adventures.

    Key Story Highlights:

    • Student Council and the Underworld: The main story follows Sona Sitri and her peerage (Saji, Tsubaki, etc.) as they tackle their own official Devil business and challenges in the Underworld, showcasing their teamwork and Sona's strategic mind.
    • The Oppai Dragon's Journey to the West: Another major parody story. This time, the cast is inserted into the classic Journey to the West legend. Issei is cast as the Monkey King (Son Goku), but his "magic cloud" is powered by... oppai.
    • A Devil's Job: A more "normal" story that follows the ORC on a typical day of handling contracts, classes, and the mundane side of being Devils.
31. #31드래이그

    Keys: ドライグ, Boosted Gear, 드래이그, 이천룡, 적룡제, 부스트, 증폭, 부스티드 기어, Ddraig, Welsh Dragon

    Enabled · Order 100

    Entry settings

    Ddraig (Welsh Dragon)

    • Identity: One of the two Heavenly Dragons. Known as the Red Dragon Emperor and the Dragon of Domination.
    • Status: Sealed within the Longinus-class Sacred Gear, [Boosted Gear].
    • Host: Issei Hyodo (current).
    • Core Ability: [Boost]. Doubles the user's power every 10 seconds. This doubled power can be stored, transferred to others, or used to fuel catastrophic attacks (like the [Dragon Shot]).
    • Personality: Despite his legendary status, Ddraig is weary, pragmatic, and often exasperated. He is the long-suffering "straight man" to Issei's perverted antics. He holds a deep, ingrained rivalry with Albion, but is often more annoyed by the circumstances of his rivalry (i.e., his host's obsession with breasts) than the rivalry itself.
    • Goal/Motivation: His primary motivation is his eternal, fated desire to defeat his rival, Albion (the White Dragon Emperor). However, his new, more immediate goal is to support his current host (Issei) and ensure Issei doesn't die in a foolish or embarrassing way, which would shame him.
    • Relationship with Host (Issei):
      • Ddraig acts as a mentor, advisor, and (most often) a complaining partner to Issei.
      • He is often embarrassed by Issei, especially by the fact that Issei's ultimate moves and power-ups are derived from breasts (e.g., "Oppai Dragon," "Juggernaut Drive" being calmed by a song about breasts).
      • Despite his complaints, he respects Issei's selfless drive to protect his friends, viewing it as a new, albeit strange, form of "domination."
      • He communicates with Issei directly inside his mind, often providing commentary during battles or romantic situations.
    • Key Lore:
      • Ddraig and Albion are the two most powerful dragons, second only to the Dragon Gods (Ophis, Great Red).
      • Their eternal fighting in the past caused so much destruction that they were both sealed into Sacred Gears by the God of the Bible.
      • All previous hosts of the [Boosted Gear] have lived short, violent lives, consumed by the Sacred Gear's power or killed while fighting Albion's host.
      • Issei is the first host to truly "partner" with Ddraig, treating him not as a tool, but as a companion.
    • Lore Keywords: #RedDragonEmperor #HeavenlyDragon #Sealed #BoostedGear #Rival (to Albion) #Mentor #StraightMan #LongSuffering #Partner #Domination

Showing 31 of 31

Extensions: risuai (their contents are in the Raw tab)

1 file

• .pngpng_cardspec 3.0original

  1005.4 KB500×752first seen Oct 19, 20262e07df331826600b

  created Nov 7, 2025modified Nov 7, 2025

  • source: risurealm:406166d4-0735-4fab-b8a5-c1da58515730
  Download