High School DxD - Locations (Enhanced)

1. #1AgreasDisabled

   Keys: Evil Piece origin, Agreas Island, floating city, Agreas

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   Agreas

   name: Agreas (Floating Island City)
   overview: Agreas is a floating island city in the Underworld — a landmass suspended in the air above the Agares Clan's territory that functions as a premium neutral venue for significant Underworld events. It was originally the source material for the crystals Ajuka Beelzebub used to create the Evil Piece system — making the island itself the literal origin point of the mechanism that defines Devil society's current structure. The island houses a city with residential and commercial areas, government offices, and the facilities that hosted Rias's debut Rating Game against Sairaorg Bael in Volume 10.
   architecture: The island is accessed by gondola lifts rising from the ground below, with waterfalls cascading from its edges into the lower landscape. The aesthetic is elevated and deliberate — a floating city designed as a statement rather than a practical location. By the later arcs it houses a major tournament stadium used for Azazel Cup matches.
   

   Agreas - Notes

   evil_piece_origin: Ajuka Beelzebub created the Evil Piece system using crystals harvested from the Agreas Island. This makes the floating city one of the most historically significant locations in the Underworld — the entire reincarnation mechanism that allowed humans, Youkai, and other species to become Devils, that produced Issei and every other reincarnated member of the cast, traces its material origin to this island. The crystals' special properties are never fully explained, but their connection to the Evil Piece system's unique qualities (mutation pieces, the ability to write developmental code into pieces) implies something extraordinary in their composition.
   qlippoth_theft: In Volume 20, the Qlippoth transported Agreas itself — the entire floating city — into their dimensional base as a resource extraction operation. The island's old-era technology and infrastructure (dating to the time of the original Maou) was their actual target, not the city's current population. Issei's team's assault on Agreas formed the climax of the volume, with the island serving as the literal stage for the confrontation with Rizevim Livan Lucifer.
   rating_game_venue: The Agares Clan's Arch-Duke facilitated the use of Agreas as neutral ground for high-profile Rating Games, positioning the island between the Gremory and Bael political spheres. Rias vs Sairaorg was held there specifically because neither side could claim it as home territory. The live audience capacity and the gondola-lift dramatic entry makes it the series' most visually defined tournament location before the Azazel Cup-era purpose-built stadiums.
   azazel_cup_use: By the Azazel Cup arc, Agreas hosts the tournament's opening ceremony and bracket draw in addition to serving as a match venue. The bracket draw revealing Issei's first main-stage match against Rias's team — announced at Agreas — produced the volume's most immediate tournament-stakes moment.
   

2. #2AsgardDisabled

   Keys: Valhalla, Asgard, Norse territory, Thor Stadium, Norse realm

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   Asgard

   name: Asgard
   overview: Asgard is the home realm of the Norse Gods — an elevated dimensional territory that serves as the seat of the Norse Mythology Faction and the residence of Odin, Vidar, Thor, Freyja, and the assembled Aesir pantheon. Like Heaven and the Underworld, Asgard is a fully developed supernatural civilization with its own infrastructure, culture, and political dynamics. Its relationship with the Three Factions Alliance shifted from cautious non-involvement to active partnership through the Loki arc in Volume 7, which introduced Odin and Rossweisse to D×D through a direct military crisis.
   physical_character: Asgard is described as befitting a Norse mythology setting — great halls, mountain landscapes, and the institutional weight of a civilization that has been generating legendary warriors and divine artifacts for millennia. Valhalla, the great hall of the honored dead, functions within its structure. The realm contains the training grounds, armories, and political assembly spaces appropriate to a divine warrior culture.
   

   Asgard - Notes

   odin_and_diplomacy: The Asgard-D×D alliance was established through the crisis of Volume 7's Loki arc rather than through diplomatic process — Odin was visiting Japan for a meeting with the Japanese Gods when Loki attacked, and the joint effort to defeat him and Fenrir cemented a working relationship. Odin's subsequent abandonment of Rossweisse in Japan was deliberate (he wanted to give her the opportunity to build a life outside his supervision), and his dealings with D×D afterward maintained the characteristically capricious quality the series gives him.
   rossweisse_connection: Rossweisse is the series' most direct line to Asgard's internal culture. Her perspective as a former Valkyrie — capable, underpaid, repeatedly passed over for the legendary valkyrie status that goes to women like Brynhildr — humanizes a mythological realm that might otherwise be purely legendary. Her grandmother Gondur's standing within Norse magical tradition, and Brynhildr's role as the strongest Valkyrie, establish the hierarchy Rossweisse operated within and what it cost her to leave it.
   vidar_matchup: Vidar — Odin's son and his successor as the chief deity of Asgard — participates in the Azazel Cup on a team with Typhon, Apollon, Artemis, Brynhildr, and Midgardsormr. His match against Issei in Volume 25 was framed around the marriage interview Vidar arranged as a mechanism to force Issei to publicly commit to Rossweisse — a tournament bet structured as a test of whether the Sekiryuutei would fight a God for a woman he cared about. Vidar won the bet, lost the match, and departed satisfied.
   thor_stadium: Thor Stadium in Valhalla was the venue for the Issei vs Vidar Azazel Cup match. The stadium was dedicated to Thor — the thunder god whose hammer Mjolnir Issei wielded against Loki in Volume 7. The detail that the match took place in a stadium named for one of Issei's past victories against Norse mythology while he fought its leadership is characteristic of how the series layers its callbacks.
   

3. #3Auros AcademyDisabled

   Keys: Agares territory school, Sona's school, Auros Academy, Underworld school

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   Auros Academy

   name: Auros Academy
   overview: Auros Academy is Sona Sitri's dream project — a school built in the Agares territory of the Underworld specifically designed to provide formal education to Devils who lack access to quality schooling. Sona's long-term goal, stated explicitly multiple times across the series, is to democratize education in the Underworld: to create a system where Devils advance on merit and ability rather than birth rank and political connection. Auros Academy is the physical embodiment of that goal, years of planning compressed into a building that she invested everything except her Rating Game ambitions in building.
   location: Auros Academy sits in the Agares Clan's territory — chosen because the Arch-Duke of Agares is neutral between the major political factions, giving the school genuine independence from both the current Maou's progressive faction and the Great King Faction's conservative bloc. The school's placement in Agares territory was itself a political statement about Sona's independence.
   

   Auros Academy - Notes

   construction_significance: The construction of Auros Academy across multiple volumes — referenced in passing through Saji's dreams, through Sona's fundraising efforts, and through the open-school event in Volume 17 — functions as the series' most patient institutional arc. When it opens, it is immediately the target of the Qlippoth's Walburga, who burns it with Incinerate Anthem. Sona charges in to protect it before anyone can stop her. The sight of the building on fire is described as the series' most emotionally devastating institutional destruction because of everything it represented.
   open_school_event: Volume 17's Auros Academy open-school event was the occasion for D×D's first encounter with the Qlippoth's direct assault — Walburga's Incinerate Anthem, Grendel's rampage, Euclid Lucifuge's appearance. The event brought children from across the Agares territory with their parents for what was supposed to be a promotional day for the new school. Lirenkus — the boy who could not produce demonic power and was told he might never be able to — produced his first small flame under Rossweisse's instruction during the event. His father was in tears. The Evil Dragon attack that followed turned those tears into grief.
   rebuild_after_attack: Auros Academy was rebuilt following the Volume 17 attack, and the reconstruction became a community project across the Agares territory — the people of the region investing in restoring what had been built for them. The corridor of children's drawings and messages preserved during the reconstruction (wishes to attend the school, drawings of the Oppai Dragon) became the emotional backdrop for the next arc's preparatory scenes.
   saji_as_teacher: Saji's dream of becoming a teacher is directly connected to Auros Academy — he visits the school between training sessions by the later arcs, already treating the teaching staff as colleagues and the students as his responsibility. His Balance Breaker being achieved by publicly declaring his dream in front of children who called him Sensei is structurally tied to this specific building and what it means to him.
   

4. #4Dimensional GapDisabled

   Keys: space between worlds, Dimensional Gap, Gap, Void Dimension

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   Dimensional Gap

   name: Dimensional Gap
   overview: The Dimensional Gap (Jigen no Sukima) is the infinite void that exists between and around the three primary worlds of the series — the Human World, the Underworld, and Heaven. It is not a world in any conventional sense but a formless, boundless expanse of nothingness that separates all realms from each other. Beings without sufficient power cannot survive in it — the Gap's non-environment actively dismantles physical forms that are not strong enough to persist within it. For those who can survive it, the Gap functions as the primary transit corridor between worlds, with magic circles serving as the infrastructure for controlled crossing.
   residents: Two known beings have made the Dimensional Gap their permanent home. Great Red, the True Dragon and Apocalypse Dragon, roams it freely — the Gap is his domain and he has existed within it for longer than the current supernatural world order has been in place. Ophis, the Dragon God of Infinity, was born in the Gap and lived there in absolute solitude for an eternity before Great Red appeared and, through his mere presence as something larger than her silence, drove her out. Her desire to return to that silence was the entire motivation behind founding the Khaos Brigade.
   

   Dimensional Gap - Notes

   plot_significance: The Gap is the series' most consequential off-screen location. Rizevim Livan Lucifer's entire fourth-arc plan — using Trihexa to kill Great Red, then opening the Gap as an invasion route into the parallel world Evie Etoulde — made the Gap the existential stakes of that arc. In Volume 11, when Samael's curse destroyed Issei's body, his soul retreated into the Boosted Gear and drifted in the Gap until Great Red used his own flesh to reconstruct Issei's body. This reconstruction is the source of Issei's True Dragon body components, his Dragon Deification capability, and Ryuuteimaru's eventual AxA potential.
   great_red_and_issei: The physical reconstruction of Issei's body from Great Red's flesh created a permanent resonance between the two. Great Red does not communicate conventionally, but his presence and his choice to help are consistent across the series — he carries Issei and Ophis back through the Gap in Volume 12, manifests as a reflection of children's collective dreams in Volume 11, and appears in Volume 21 to make one specific acknowledgment. The fact that Ryuuteimaru has gradually absorbed the informational pattern of Great Red's power from Issei's rebuilt body is the most structurally important legacy of the Gap arc.
   isolation_barrier_field: The Dimensional Gap is the space in which the Isolation Barrier Field was sealed — Trihexa's seven bodies, the Three Factions leaders, the Seraphs, and god-class representatives from multiple mythologies are all contained within a dimensional space carved out of the Gap. The periodic communication windows allow information to pass through the barrier's boundary. Azazel transmits research from inside it.
   evie_etoulde_connection: The Gap borders the parallel world Evie Etoulde, which the Qlippoth intended to invade through it. In the Shin DxD era, the Evie faction's arrival — thirty years ahead of Azazel's projections — is directly connected to the Gap's properties as the boundary space between worlds. Regalzeva's forces emerge from spatial ruptures in the Gap when they cross into the series' world.
   

5. #5Gremory TerritoryDisabled

   Keys: Gremory Territory, Gremory domain, Gremory Castle, Underworld Castle Gremory

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   Gremory Territory

   name: Gremory Territory
   overview: The Gremory Territory is the Gremory family's domain in the Underworld — a large, prosperous region ranked 56th among the 72 Pillars but significantly more commercially developed than its rank would suggest, a result of Venelana Gremory's business strategy of identifying undervalued regional products (rare flowers, premium apples, specialty crafts) and creating markets for them in the capital. The territory's centerpiece is the Gremory Castle — a full-scale castle complex that serves as the family's primary residence and reception venue. The castle town surrounding it functions as a regional commercial and cultural hub for the area's population.
   castle_layout: The Gremory Castle is a genuine castle — large enough that Gasper had a crisis because his guest room was too spacious, and Asia and Xenovia moved their luggage into Issei's room because neither could settle in that much space alone. The Gremory family magic circle embedded beneath the Hyoudou Residence connects directly to the castle's transportation receiving area. Reception halls, family quarters, a strategic command chamber, and a large banquet facility are all noted features.
   

   Gremory Territory - Notes

   commercial_development: Venelana Gremory's business model — applied over decades — transformed what might have been a minor noble territory into one of the Underworld's most economically dynamic regions. The rare purple flowers she cultivated from rural Bael outskirts, the premium Dragon Apples grown in the domain, and the specialty regional items she introduced to capital markets all trace back to the same talent: identifying value that the established economy had overlooked. This model was later applied to Sairaorg's own property development after his reconciliation with the Bael main family.
   oppai_dragon_stadium: By the Azazel Cup arc, the Gremory castle town hosts the Oppai Dragon Stadium — a dedicated venue for tournament matches built in the town to accommodate the massive public interest in Issei's matches. Bronze statues of Issei in Scale Mail and Rias in Switch Princess attire stand at the stadium entrance. The stadium's construction reflects how thoroughly Issei has become part of the Gremory family's public identity.
   high_class_promotion_ceremony: The Gremory Territory hosted Issei's High-Class Devil promotion ceremony in Volume 22. The event included a formal certificate presentation by Ajuka Beelzebub, a crown placement by Rias, media coverage from the Underworld press, and the Oppai Dragon Song performed by a famous opera singer as the ceremonial opener — at which point Zeoticus was moved to tears and Rias's eye twitched. The ceremony was followed by the formal piece trades that moved Asia, Xenovia, and Ravel from Rias's peerage to Issei's.
   venelana_assessment: Venelana's direct statement to Issei during his first Underworld visit — delivered as institutional acknowledgment rather than warmth — that he is Rias's last act of selfishness and that as parents they bear responsibility for that until the end established the Gremory family's formal position on his relationship with their daughter. The castle is the location where this was said, which makes its subsequent role as the venue for public announcements about Rias and Issei's engagement carry particular weight.
   

6. #6Grigori HeadquartersDisabled

   Keys: Grigori institute, Fallen Angel institute, Fuyuki research facility, Grigori headquarters

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   Grigori Headquarters

   name: Grigori Headquarters
   overview: The Grigori Headquarters is the operational center of the Grigori — the organization of Fallen Angels governed by Azazel before the Trihexa sealing and subsequently by Shemhazai as the new Governor. The facility functions as both the primary Sacred Gear research institution in the series and the Fallen Angels' administrative and military command center. It houses laboratories, training facilities, medical departments, and armament workshops — the combined research output of beings who spent millennia studying supernatural phenomena rather than fighting over it.
   research_culture: The Grigori's institutional culture is defined by Azazel's influence: curiosity over combat, research over politicking, and an embarrassingly high proportion of projects that only Azazel would have conceived. The facility contains the development history of all Artificial Sacred Gears, the records of every Sacred Gear study Azazel conducted over centuries, and the ongoing research programs covering everything from Dragon power analysis to the down-fall-dragon-spear maintenance to whatever Sahariel's current chainsaw-and-Vampire experiment is producing.
   

   Grigori - Notes

   sacred_gear_research: The Grigori's most significant institutional contribution to the series is Azazel's Sacred Gear research — the centuries of study that produced the Artificial Sacred Gear system, the surgical modification technique used on Saji, the theoretical framework Ajuka Beelzebub used to develop the Evil Piece reincarnation enhancement protocols, and the specific knowledge that enabled Issei's early development as the Boosted Gear's host. The research database is the most comprehensive archive of Sacred Gear information in existence.
   cadre_staff: The Grigori's senior Cadres — each a Fallen Angel with significant military capability — serve as department heads and operational commanders. Azazel as Governor (now in the Isolation Barrier Field), Shemhazai as chief administrator, Barakiel as the new Vice-Governor after Azazel's sealing — these three form the core of the institution's leadership. Other Cadres run specific research programs: Sahariel (combat modification experiments, notable for the Missile Vampire Gasper protocol), Armaros (anti-magic development, expressed through his iron-ball training philosophy for all Sacred Gear users).
   artificial_sacred_gear_distribution: The Grigori distributes Artificial Sacred Gears as diplomatic gestures and tactical support mechanisms — the Sitri peerage received multiple, the Gremory group received Akeno's transformation bracelets, and various Church and allied warriors received specialized tools. This distribution function is the most visible expression of the Grigori's role as the alliance's technology provider.
   post_azazel_operations: After Azazel's sealing, the Grigori lost its defining personality — the Governor who drove it with a mix of genuine curiosity and calculated strategic positioning toward peace. Shemhazai's more conventional administrative approach maintains operations but cannot replicate the specific quality of inspiration Azazel brought. The institution remains functional and militarily capable, but its era-defining contributions — the Sacred Gear framework, the Artificial Sacred Gears, the peace summit facilitation — are all in the past.
   

7. #7HeavenDisabled

   Keys: Seventh Heaven, Eden, Heaven, Heaven realm, Sky realm

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   Heaven

   name: Heaven
   overview: Heaven (Tenkai) is the realm of the Angels and the administrative seat of the God of the Bible's authority — maintained as a functioning institution by Michael and the Four Great Seraphs even after the God's death in the Great War. It exists above the Human World in a spiritually elevated dimensional layer and is divided into multiple numbered floors or levels, each serving a distinct administrative or sacred function. Heaven is not merely a physical location but an institutional framework: the infrastructure for the Brave Saints reincarnation system, the Sacred Gear administrative network, and the holy authority that makes Angelic powers function all run through Heaven's systems.
   structure: Heaven is organized across seven main levels. The first and second floors are a frontline base and prison respectively, the third is the main Angel residential and administrative area, the fourth is the Garden of Eden (preserved and sealed), the fifth is the former Grigori territory and now a research laboratory, and the sixth and seventh floors contain the Seraphim's primary working space and the highest sacred systems — the Sacred Gear framework and theological infrastructure left behind by the God of the Bible. The main administrative building Zebel exists within Heaven's central layers.
   

   Heaven - Notes

   god_s_death_and_aftermath: The God of the Bible was killed during the Great War fighting alongside his Angels against the combined Devil and Fallen Angel forces. His death was concealed from the general population of all three factions for centuries — the Three Factions leadership agreed to maintain the fiction because the collapse of human faith would erode the power base of Heaven and the infrastructure of the Sacred Gear system simultaneously. Michael assumed full administrative authority and has managed Heaven as an institution without a sovereign ever since. By Volume 3, Kokabiel uses the secret as a weapon: announcing it mid-battle as psychological artillery against the Gremory group.
   garden_of_eden: The Fourth Heaven houses the preserved Garden of Eden, sealed after the original events described in Genesis. It remains within Heaven's structure, accessible but sealed from casual entry. During the Qlippoth's invasion of Heaven in Volume 18, combat reached the Garden — Yaegaki Masaomi and Issei's battle concluding there. Rizevim specifically targeted Heaven's invasion to locate the Fruits of Wisdom and Life hidden in the Garden and in Purgatory, having used the Sephiroth Graal's resonance to confirm their locations.
   qlippoth_invasion: Rizevim Livan Lucifer led the assault on Heaven in Volume 18 with Evil Dragons, the Sephiroth Graal, and his own Super Devil-class power. The invasion penetrated Heaven's defenses and caused significant structural damage. The specific purpose was to recover the Fruits of Wisdom and Life from within Heaven's sealed spaces. Asia Argento's tamed Evil Dragons fighting within Heaven — former monsters behaving as her devoted companions inside the most sacred angelic realm — is one of the series' most striking images of how far its world has changed.
   post_sealing: After Michael, Raphael, and Uriel sealed themselves inside the Isolation Barrier Field with Trihexa in Volume 21, Gabriel assumed leadership of Heaven and all Angelic operations. The Brave Saints peerages of the sealed Seraphs continue operating. Gabriel took over the Sacred Gear system's administrative functions. Heaven began reconstruction of the Qlippoth invasion's physical damage while managing the political reality of losing three of its four leaders simultaneously.
   baby_room: Michael designed a specific dimensional space — accessible through a modified doorknob — in which an Angel and a Devil can be intimate without the Angel falling from grace. This 'baby room' was given to Issei specifically to facilitate his relationship with Irina. Its existence confirms that Heaven's purity enforcement system is administrative rather than absolute — it can be locally suspended within a space designed with Michael's deliberate consent.
   

8. #8Hyoudou ResidenceDisabled

   Keys: Issei's house, Hyoudou house, ORC base, Hyoudou Residence

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   Hyoudou Residence

   name: Hyoudou Residence
   overview: The Hyoudou Residence is the home of Issei Hyoudou and his parents in Kuoh Town, and the de facto operational headquarters of the Gremory peerage and its allied network. Originally a normal two-story terrace house with a light blue exterior, it was renovated by the Gremory Clan in Volume 5 into a six-story building with three basement floors following the Khaos Brigade's emergence as a threat requiring a proper base of operations. By the Shin DxD era it houses an extraordinary number of residents: most of the former ORC girls, members of the Vali Team (Kuroka and Le Fay), Kunou, Elmenhilde, Ophis, Lilith, and multiple visiting parties on rotating basis.
   floor_layout: First floor — living room, kitchen, Japanese-style rooms (washitsu), guest areas. Second floor — Issei's room (center), Rias's room (connected left door), Asia's room (connected right door), bathroom. Third floor — Issei's parents' room, study, storage. Fourth floor — Akeno's, Xenovia's, Koneko's rooms. Fifth floor — Irina's, Rossweisse's, Ravel's rooms. Sixth floor (VIP Room) — converted meeting space for Three Factions coordination. Rooftop — communal garden with vegetable plots, tea table, Ophis's sun-bathing shrine corner.
   

   Hyoudou Residence - Notes

   basement_floors: The first basement floor contains a movie theater, multiple training rooms, changing rooms, and two separate bath complexes — a standard communal bath with a refrigerator stocked with fruit milk, regular milk, and coffee milk, and a luxurious secret bath discovered in Volume 26 decorated with tropical plants, Dragon head water spouts, and Gremory crests. The second basement floor is a full heated indoor swimming pool. The third basement is primarily storage with a library section. The underground space beneath the residence houses the Gremory family magic circle and serves as the entry point for all transportation between Kuoh Town and the Underworld.
   renovation_politics: Sirzechs arranged the renovation while the group was sleeping, simultaneously relocating the neighboring households through generous resettlement packages. Rias objected to having her brother control the family's living arrangements; he proceeded anyway. The scale of the renovation — an entire city block transformed overnight — is one of the earliest demonstrations of what Maou-class resources actually look like applied to a domestic context.
   erotic_doorknob_room: The Grigori, after receiving Heaven's baby-room doorknob technology from Michael, developed their own version — a modification that creates an erotic dimensional space accessible from a specific door handle. This was installed in the Hyoudou Residence and has been the site of multiple significant relationship moments between Issei and various residents. Rossweisse used it in Volume 25 to create the circumstances for her honest declaration of feelings toward Issei.
   operational_significance: The Hyoudou Residence functions as D×D's informal coordination space — strategy meetings, inter-faction communications, welcome parties for new allies, and all manner of supernatural crisis responses originate from this address. By the Shin DxD era, it has also become the base for the Hyoudou Issei Household Office, with Ravel managing Issei's independent High-Class Devil operation from a dedicated room on one of the upper floors.
   

9. #9Kuoh AcademyDisabled

   Keys: Kuoh Academy, Kuou Academy, old school building, school building

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   Kuoh Academy

   name: Kuoh Academy
   overview: Kuoh Academy (Kuō Gakuen) is a prestigious private school in Kuoh Town — originally an all-girls school that converted to co-educational before the series begins, though girls still significantly outnumber boys. It is simultaneously a normal high school with regular academic and athletic programs and the primary operational cover for two Devil peerages: the Gremory Peerage manages the Occult Research Club, and the Sitri Peerage manages the Student Council. The school is administratively owned by the Gremory family, with Zeoticus Gremory listed as administrator — a fact that gives the family authority over personnel decisions including faculty appointments.
   structure: The school has a new building and an old building. The old building houses the Occult Research Club's room on its top floor — the room itself is furnished with a sofa, tea table, bookshelves, and a magic circle embedded in the floor that connects to the Gremory territory in the Underworld. The new building houses standard classrooms, teacher offices, and administrative spaces. The school grounds include sports courts, a gymnasium, and a rooftop accessible from the upper floors.
   

   Kuoh Academy - Notes

   occult_research_club: The ORC room in the old building is the series' primary domestic space for the Gremory peerage — the place where contracts are assigned, crises are briefed, tea is served, and the group processes everything from supernatural disasters to relationship developments. The magic circle in the floor is the fastest route to the Gremory territory in the Underworld and serves as the deployment point for all emergency operations. Rias's graduation in Volume 22 — meaning the room is no longer technically hers — is handled with explicit emotional weight, with Rias, Akeno, and Issei spending the pre-dawn hours sitting in it one last time before the ceremony.
   student_council: The Student Council under Sona Sitri operated as the Sitri Peerage's command center, with the student council room serving the same function as the ORC room does for the Gremory group. The Student Council under Xenovia Quarta (from Volume 19 onward) inherits this dual function while becoming something genuinely different in character — Xenovia's approach to the presidency being organized around genuine affection for the school rather than political management.
   cleria_belial_history: Kuoh Town was previously managed by Cleria Belial, a High-Class Devil of the House of Belial whose territory this was before the current arrangement. Her relationship with Yaegaki Masaomi — an exorcist assigned to the same territory — was ended by a joint operation between old-guard Devils and the Church, resulting in both their deaths. The history is revealed in Volume 18 and transforms the background of the school's location from neutral administrative setting to the site of a suppressed tragedy.
   school_events: Kuoh Academy hosts annual events that have all produced significant supernatural incidents: the school trip to Kyoto (Volume 9, Hero Faction), the school festival (Volume 10, Rating Game preparation), sports day (Volume 13, Three Factions athletics event), and the Ball Tournament (Volume 3, Kiba's absence arc). The school festival ORC Occult Mansion in Volume 10 was built while Issei was processing his feelings toward Rias — it runs as background domestic comedy against the Sairaorg Rating Game's weight.
   

10. #10Kuoh TownDisabled

    Keys: Kuoh Town, Kuoh, Kuou Town, Three Factions neutral ground

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    Kuoh Town

    name: Kuoh Town
    overview: Kuoh Town (Kuō-machi) is the primary setting of High School DxD — a small Japanese city that serves as the focal point for the supernatural politics of the Three Factions in the modern era. It is an ordinary-seeming mid-sized Japanese town with residential neighborhoods, a commercial district, parks, and a train station, distinguished only by the extraordinary density of supernatural activity occurring invisibly within it.
    history: Kuoh Town was selected as the location for the secret Three Factions peace summit — the meeting that began the diplomatic process formalized in Volume 4 as the Three Factions Treaty. Its status as the location where this negotiation occurred made it simultaneously politically significant (as the birthplace of the alliance) and practically neutral (too valuable to either side to risk destroying in conflict). The Cleria Belial incident — discovered in Volume 18 — reveals that the town's recent history included a suppressed cross-faction romance and murder, adding personal weight to what seemed like an administrative choice.
    

    Kuoh Town - Notes

    devil_presence: Two High-Class Devil peerages share management of Kuoh Town's devil territory: the Gremory Peerage (Rias) handles the southern district and the Sitri Peerage (Sona) handles the northern. Each distributes summoning leaflets, manages contracts, and handles supernatural disturbances within their respective areas. The arrangement is remarkably stable — Rias and Sona have known each other since childhood and coordinate effectively despite their competitive relationship.
    grigori_presence: Azazel installed himself as a chemistry teacher at Kuoh Academy as an observation post and served as the group's faculty advisor once his identity was disclosed. The Grigori maintains underground research facilities beneath the town — the same facilities Issei visited in Volume 15 when Akeno's SM session with her father became an accidental parent-teacher meeting. After Azazel's departure, Shemhazai took over Grigori administration and the town became one of multiple Alliance-supervised locations rather than Azazel's personal project.
    supernatural_infrastructure: A combined Three Factions barrier surrounds Kuoh Town, designed to limit collateral damage from supernatural incidents and prevent human observation of ongoing activities. The barrier's blueprints were compromised — leaked to the Alliance of Hell by embedded Khaos Brigade spies — a vulnerability that contributed to the strategic planning of multiple Qlippoth-era attacks. Rossweisse joined Kuoh Academy's faculty as a civics teacher following Azazel's sealing, extending the supernatural teaching staff.
    human_residents: The ordinary residents of Kuoh Town — including Issei's parents, his classmates Matsuda and Motohama, and contract clients like Morisawa — exist in complete ignorance of the supernatural activity around them. Kiryuu Aika is the notable exception: she learned the group's true identities when she summoned Xenovia accidentally and has kept the secret while remaining a genuine friend. The series returns to her normality repeatedly as a measure of how far the supernatural world has drifted from the human one.
    

11. #11Kyoto and UrakyotoDisabled

    Keys: Fushimi Inari, West Youkai territory, Urakyoto, Kyoto

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    Kyoto and Urakyoto

    name: Kyoto and Urakyoto
    overview: Kyoto is one of Japan's ancient capital cities and the primary territory of the West Youkai Faction. Historically the imperial capital and the center of Japanese court culture, Kyoto's accumulated sacred architecture — shrines, temples, torii gates, and holy sites — has saturated the city with spiritual energy over more than a thousand years. This makes it simultaneously a sacred space hostile to Devils and a power reservoir of enormous scale for beings who can draw on leyline energy. Urakyoto — the parallel dimension overlapping Kyoto accessible through a specific torii gate — is the Youkai Faction's actual operational headquarters, invisible to ordinary humans.
    urakyoto: Urakyoto is the supernatural layer of Kyoto — a parallel space accessible through a specific torii gate that shifts the environment from modern Japan to Edo-period aesthetics under a different sky. It functions as the West Youkai Faction's capital: Yasaka's mansion, the offices of the faction's leadership, and the residential areas for Youkai who need more than the normal urban camouflage allow. The transition through the gate is described as a shift from blue sky to dim amber-toned light and the modern cityscape replaced by traditional architecture.
    

    Kyoto and Urakyoto - Notes

    supernatural_significance: Kyoto's density of holy sites creates a specific challenge for Devils: the sacred ground radiates an aura hostile to demonic presence. Rias's group requires special travel permission and 'holy site passes' from Yasaka's faction whenever they visit. The spiritual energy accumulation through the city's leylines is enormous — when Yasaka is connected to them she has access to essentially unlimited spiritual power within the city's bounds, making her categorically more powerful in Kyoto than anywhere else. Her inability to leave for extended periods without this advantage is the strategic vulnerability the Hero Faction exploited in Volume 9.
    kyoto_arc: The Hero Faction kidnapped Yasaka to use her nine-tailed fox power as a ritual instrument to summon a sun deity, using the Togetsukyou bridge as the focal point. Issei's group — present on the school field trip — coordinated with Sun Wukong to rescue her, deploying Bilingual as the communication mechanism that allowed Kunou to reach her mother's suppressed consciousness. The rescue established D×D's alliance with the West Youkai Faction.
    ephemeral_protective_systems: Kyoto's accumulated sacred power functions as an environmental defense — leylines flowing through the ancient shrine networks make large-scale hostile magic operations difficult to sustain. Erebus exploited a vulnerability in this system in Shin DxD Volume 3 by placing corrupting Olympian magic within the Kshitigarbha (Jizo statues) throughout the city, attempting to propagate contamination outward through Japan's spiritual network using the leylines as a distribution system.
    oppai_dragon_events: Kyoto has hosted multiple Oppai Dragon show events for the Youkai community, attended by children from across Urakyoto. These events serve a diplomatic function — maintaining the personal relationship between D×D's most public figure and the West Youkai Faction's population — as well as providing Issei with direct reminders of who he is fighting for. The events are consistently among the series' most tonally domestic passages, featuring Issei signing autographs for fox-eared children while managing crisis cleanup from the previous day.
    

12. #12London (England)Disabled

    Keys: underground London battle, London, England DxD, West Acton

    Disabled · Before character · Order 10 · 100%

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    London (England)

    name: London
    overview: London serves as the primary setting for two significant arcs in the series: the Alliance of Hell arc (Volume 18's underground battle sequence) and the extended England arc of Shin DxD Volume 4, which constitutes the series' largest single-location military operation outside the Underworld. The city functions as both a genuine metropolis with its own supernatural history (the Pendragon lineage, the Church's British operations, the Golden Dawn's security magic traditions) and as a neutral ground where supernatural operations can be conducted away from the Three Factions' home territories.
    pendragon_connection: The Pendragon family — Arthur and Le Fay — maintain their base in England. Their father Lord Uther Pendragon leads a household that was entrusted with Collbrande, the Holy King Sword. The family's connection to Arthurian legend gives them a specific standing in England's supernatural landscape, and their estate functions as D×D's informal British headquarters in later arcs. Irina's parents, who relocated to England for Church work, run a Japanese restaurant in West Acton that became D×D's operational base during the London arc.
    

    London - Notes

    alliance_of_hell_arc: In Volume 18, Georg used his Dimension Lost Balance Breaker to create a contained artificial space for the joint D×D-Hero Faction operation against the underground Alliance of Hell stronghold beneath London. The artificial space confined the battle to prevent civilian casualties while allowing both sides to commit full power. The operation's success in defeating Angra Mainyu and pursuing Rizevim was the fourth arc's most coordinated tactical achievement.
    shin_dxd_london_operation: The Shin DxD Volume 4 London operation is the series' most elaborate single-battle sequence. Magnus Rose from the CIA and British MI6 coordinated with D×D to displace London's entire population into a pseudo-London for forty minutes. Within that window, simultaneous operations occurred: Rias's team and Dulio against Verrine and Meredith, Sairaorg against Balberith, and Issei and Vali against Hades and Angra Mainyu underground. The coordination required buy-in from every participating mythology's divine representatives.
    alphecca_tyrant_attack: The hotel elevator in London was the location where Meredith Ordinton's operative placed a holy nail from the Longinus Alphecca Tyrant into Issei's body, rewriting the concept of his perverted desire and sealing his miracle-generating abilities. The attack's anonymous and casual delivery — during what appeared to be a routine elevator ride — made it the most understated devastating operation in the series.
    west_acton_restaurant: Irina's parents' Japanese restaurant became D×D's base of operations for the London arc because it offered a legitimate civilian cover, proximity to the Pendragon family's network, and the logistical support of a commercial kitchen. The pre-battle dinner — Irina's mother's Angel-face Makizushi rolls shaped like Irina's face, which mortified her daughter and delighted her father — is the series' best single deployment of domestic comfort against the weight of incoming violence.
    

13. #13The Netherworld (Hades's Domain)Disabled

    Keys: Realm of the Dead, Cocytus, Hades domain, Netherworld, underworld hell

    Disabled · Before character · Order 10 · 100%

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    The Netherworld (Hades's Domain)

    name: The Netherworld
    overview: The Netherworld is the realm of the dead in the series — distinct from the Devil Underworld, it is the dimension where deceased souls are processed, judged, and assigned their afterlives. It is governed by Hades, the Greek God of the Dead, with a hierarchical structure of Grim Reapers (death gods) managing the population flow. Cocytus — the frozen river of lamentation in Greek mythology — exists within the Netherworld as its deepest and most secure containment level. The Netherworld's leadership operates largely outside the Three Factions' political structure, maintaining historical neutrality that increasingly concealed active hostility.
    structure: The Netherworld contains multiple functional layers: the processing areas where souls enter, the residence areas for those awaiting judgment, the punitive zones including Cocytus at the deepest level, and the administrative spaces where Hades and the Grim Reaper hierarchy operate. The alliance between the Netherworld and the Qlippoth — revealed gradually across the third and fourth arcs — meant Hades was providing logistical and tactical support to the series' primary antagonists while maintaining a public posture of neutrality.
    

    The Netherworld - Notes

    hades_agenda: Hades's participation in the Qlippoth-adjacent operations — providing Apophis and Aži Dahāka access to Heaven through a Purgatory route, facilitating Grim Reaper attacks on D×D allies, and ultimately deploying his own forces in London — was motivated by a specific hatred of D×D and its cross-faction alliance model. He believed the supernatural world should remain under the governance of death-adjacent powers (including his own faction) rather than the cooperative structure D×D represented. Thanatos, an ultimate-class Grim Reaper operating independently of Hades's direct orders, confirms the Netherworld is not politically unified — its conservative and militant factions have different agendas.
    grigori_coordination: Bennia Orcus — Sona Sitri's half-Grim-Reaper Knight — is the series' primary humanizing connection to the Netherworld's internal politics. Her father Orcus, a conservative-faction Grim Reaper who addresses her with embarrassing affection (Bennia-tan), serves as a covert intelligence source for D×D when Thanatos's independent actions make the Netherworld's own conservative faction willing to share information.
    purgatory: Purgatory, the transitional zone between life and the afterlife, was used by the Qlippoth as a transit corridor for their Heaven invasion in Volume 18 — with Apophis brokering access through Hades's cooperation. Georg and Leonardo later lived in Purgatory (the Realm of the Dead) while studying Grim Reaper magic under historical Magician tutors, confirming that the living can inhabit the transitional zone under specific conditions.
    cocytus: Kokabiel, who declared war on all three factions in Volume 3, was imprisoned in Cocytus following his capture by Vali. The frozen layer is the Netherworld's maximum containment — reserved for entities so dangerous that simple death is insufficient and conventional imprisonment cannot hold them. Kokabiel's imprisonment there rather than his execution reflects the series' consistent preference for containment over elimination when dealing with former major threats.
    london_operation: The Alliance of Hell's final battle in Shin DxD Volume 4 took place under London — Hades deployed his forces including the fake Heavenly Dragons, the Aži Dahāka clone, and himself against D×D in the underground Netherworld-territory below the city. His defeat by the combined D×D coalition ended the Netherworld's active hostility, though the political reconstruction afterward remained an open question.
    

14. #14Romania (Tepes Territory)Disabled

    Keys: Romania, Tepes Castle, Vampire territory, Romania arc

    Disabled · Before character · Order 10 · 100%

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    Romania (Tepes Territory)

    name: Romania (Vampire Territory — Tepes)
    overview: Romania is the primary setting of the vampire arc in Volumes 14-16, serving as the home territory of the Tepes Faction — one of the two great Vampire clans. The Tepes Faction's castle town sits within the Carpathian mountains, accessible by mountain gondola lift through winter landscapes. The castle itself is ancient, architecturally Gothic, and — during the Romania arc — the site of a political coup staged by Marius Tepes specifically to access Valerie Tepes's Sephiroth Graal. The territory represents the most isolated and internally hierarchical of the series' visited locations — a Vampire society that was largely sealed off from the Three Factions before the Romania arc forced contact.
    castle_layout: The castle complex includes a main reception hall, private research facilities used by Marius for Sephiroth Graal experiments, an indoor garden where Valerie and Gasper held their daily tea sessions, and dungeons where the Vladi family head and other political prisoners were held. The castle town surrounding it, inhabited by Tepes Clan Vampires and their servants, appeared completely normal from the exterior — residents were unaware of the coup when Issei's group first arrived.
    

    Romania - Notes

    vampire_society: The Tepes Faction operates on a male-supremacy hierarchy — a direct contrast to the Carmilla Faction, where women hold authority. This division between the two major Vampire clans has produced centuries of political tension. The Tepes Faction's historical discrimination against Dhampirs (half-vampire, half-human hybrids) was the social context that produced both Gasper's exile and Valerie's difficult position as a Dhampir holding Royal succession rights.
    qlippoth_connection: The Romania arc's primary catastrophe — Rizevim using the extracted Sephiroth Graal to mass-convert Tepes Vampires into Evil Dragons — transformed the territory into a combat zone. Tepes Vampires who accepted the power voluntarily became hybrid entities stripped of their weaknesses and enhanced with Dragon-class durability, forming the Qlippoth's primary mass combat force. The destruction in the castle town during the battle between these hybrid entities and D×D caused significant civilian casualties.
    valerie_post_arc: Following the Romania arc's resolution, Valerie Tepes — having survived Marius's extraction attempt due to her triple sub-species Sephiroth Graal — became the new legitimate ruler of the Tepes Faction and aligned it with the Three Factions Alliance. The political settlement involved the Carmilla Faction and resulted in the first genuine diplomatic normalization between the two Vampire clans and the wider supernatural community.
    euclid_lucifuge: Romania was also the site where Euclid Lucifuge — Grayfia's younger brother — was first revealed as a major antagonist, serving as an adviser to Marius's coup government. His ability to penetrate any barrier calibrated to Grayfia made his presence in the castle simultaneously a Qlippoth intelligence operation and a personal expression of his fixation on his sister's choices.
    

15. #15The UnderworldDisabled

    Keys: Underworld, Lilith capital, Lucifaad, Devil realm, Hell

    Disabled · Before character · Order 10 · 100%

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    The Underworld

    name: The Underworld (Hell)
    overview: The Underworld (Meikai / Makai) is the home dimension of Devils — a vast realm roughly equivalent in size to the Human World but with no oceans, only lakes and rivers crossing an enormous continuous landmass. The sky was originally a permanent purple color, day and night alike, until the current Four Great Satans modified the time-flow and created an artificial moon using Demonic Power to match the Human World's day-night cycle, accommodating the large number of reincarnated Devils who came from human backgrounds. The Underworld is divided into regional territories governed by the noble houses of the 72 Pillars, with the Four Great Satans holding the most powerful positions.
    geography: The Underworld is organized into territories corresponding to each noble house's historical holdings. The major cities — Lilith (the current capital), Lucifaad (the former capital), and the numerous regional centers of each Pillar family — are connected by rail infrastructure that mirrors human train systems. The development of commercial and entertainment districts in the current era means the Underworld looks, in many places, like a modernized Japanese or European city under a purple sky.
    

    The Underworld - Notes

    lilith_the_capital: The modern capital of the Underworld is Lilith — named after the first woman, the mother of Devils. It serves as the political, commercial, and cultural center of Devil society. The four Satans' administrative buildings, the Rating Game broadcasting infrastructure, the Devil class examination facilities, and the Noble Assembly are all located in or near Lilith. It is also the location of the Oppai Dragon concert hall and the venue for the High-Class Devil promotion ceremonies.
    lucifaad: The original capital of the Underworld, where the original four Satans ruled and the children of the great houses gathered for the Young Devils Assembly — a forum that nominally served as political networking but functioned primarily as a display of the Satan lineage's authority over the common nobility. It is the site of the final battle of the Devil Civil War, where Sirzechs defeated and killed Bidleid, ending the conflict.
    territorial_structure: Each of the 72 Pillars holds territory proportional to their rank. The Great King houses (Bael, Agares, Vassago, etc.) hold the largest territories with the most developed infrastructure. Lower-ranked Pillars hold smaller domains. The Gremory territory is noted for being unusually prosperous for a house ranked 56th — a result of Venelana Gremory's business model of identifying undervalued products from rural areas and developing markets for them in the capital.
    political_history: The Underworld was devastated by the Great War's casualties, which reduced the Devil population catastrophically and prompted the creation of the Evil Piece reincarnation system. The resulting ideological conflict between the traditionalist Old Satan Faction (who rejected non-pure-blood reincarnates) and the reformist Anti-Satan Faction (who supported it) produced the Devil Civil War that ended with Sirzechs's generation establishing the current government. The four current Satans — Sirzechs Lucifer, Serafall Leviathan, Ajuka Beelzebub, Falbium Asmodeus — use the historical names of the original four Satans as titles rather than family names.
    rating_game_culture: The Rating Game is the Underworld's primary entertainment institution and social mobility mechanism. Top-ranked players are cultural heroes, broadcast live to massive audiences. The corruption of the top nine rankings through illegal King Pieces — exposed by Diehauser Belial's broadcast in Volume 20 — was not merely a sports scandal but a political crisis, demonstrating that the institution most trusted to measure legitimate Devil excellence had been rigged by the same old-guard faction that lost the Civil War.
    

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