Kimetsu no Yaiba

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1. #1Time Period

   Keys: the year, The date

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   The world of Kimetsu no Yaiba takes place in the Taishō period of Japan, more specifically 1912 the beginning of the Taishō period. During this time, things like trains, medicines, western sciences and media were slowly getting known by Japan, but many areas were still very traditional and followed older customs, very few districts of Japan actually embraced modernity and the incoming technology from the west.

2. #2Demons

   Keys: demon kind, demon, Demons

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   Created by Muzan Kibutsuji, Demons are supernatural beings who have existed since the late years of 900 in Japan and have lumbered away in the night eating humans and drinking their blood as a way to regain their energy. Due to them no longer being human however, most demons are incapable of eating human food anymore meaning blood is almost always a demon's only source of energy, very rarely can demons grow out of this reliance on blood and find other sources of energy but almost no demons have done this.

   Being 'supernatural' demons all have superhuman levels of strength, durability, and agility in comparison to normal humans, and are noticeably different in appearance when compared to normal humans, especially their eyes and skin, with some demons even being more monster-esque or animal-like than actual human, this is due to the fact that demons can control their bodies to the molecular level and even manipulate their flesh to their will in the form of creating weapons, or in very special cases their blood demon art, which are supernatural abilites that are specific to each demon and are only unlocked if a demon has eaten enough humans, or they received a large dose of Muzan's blood or other energy-boosting things.

   Due to being creatures of the night, Demons are physically incapable of going out into the sun or any direct daylight, as the sun will cause them immense pain and burn them, while also slowing down their regeneration. Even just being out in direct sunlight for 10 seconds is enough to fully kill a demon, another weakness is that if their head is cut off by a specific katana made of a special type of metal that absorbs sunlight, or Wisteria poisoning which is the only known substance that can actually harm them, outside of that the demons can't be killed by any other means.

3. #3King of Demons

   Keys: Demon king, progenitor of demons, demon progenitor, Lord Muzan, king of demons

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   Lord Muzan otherwise known as Muzan Kibutsuji was the first demon in existence and is considered to be not only the strongest, but also the longest living demon in existence, however he wasn't always human.

   When he was human around the years of 900 in Japan, Muzan was diagnosed with an unknown disease that made it almost impossible for him to walk or even eat, it was this hopeless life that he utterly despited due to how helpless it made him feel, and it didn't help that his Doctor's cure hadn't worked... At first, for what Muzan didn't know was that the cure used on him included the flower of the Blue Spider Lily otherwise known as the flower responsible for the creation of demons.

4. #4The 12 Kizuki

   Keys: the 12 moons, kizuki, 12 demon moons, 12 Kizuki

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   A list of the 12 strongest demons underneath Muzan Kibutsuji himself, these 12 demons are also under his direct command and are split into two separate groups; Uppermoons which are considered to be the strongest demons and then the Lowermoons which are below the Uppermoons in power but are stronger than most demons, all together there are 6 Upper ranks ranging from Uppermoon 1 all the way to 6, with Uppermoon 1 being the second strongest demon in existence directly under Muzan himself with Uppermoon 6 being the 7th strongest demon in existence. This scaling follows up to the Lowermoons which starts at Lowermoon 1 which is the strongest of the Lowermoons but significantly weaker than Uppermoon 6, and it ends at Lowermoon 6; which is considered to be the weakest of the 12 kizuki but is still stronger than any standard demon, there are only 3 real ways to move up in rankings, those three ways being as follows; 1: One of the 12 Kizuki dies, which results in a the remaining kizuki either moving up or staying in the same ranking depending on which of the 12 were to die 2: A demon happens to naturally become stronger than one of the 12 Kizuki though eating enough humans, however this is very rare as most demons don't last long enough to do this. 3: Blood Demon Battle, which is essentially a fight between demons in the 12 Kizuki, mostly for a lower ranking uppermoon or lowermoon going up against a 12 kizuki member of higher rank to try and gain the higher rank.

5. #5Uppermoon

   Keys: Uppermoon 3, Upper rank 6, Upper rank 2, Uppermoon 6, Uppermoon 5, Upper rank 4, Upper rank 3, Uppermoon 2, Uppermoon 1, Uppermoons, Uppermoon 4, Upper rank 5, Upper rank 1

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   The 6 of the strongest demons directly under the demon king himself, the rankings of the Uppermoons goes as follows under the Demon King. It starts with Demon King Muzan, then Uppermoon 1, then Uppermoon 2, to Uppermoon 3, then 4, followed by Uppermoon 5 and then 6, with Uppermoon 1 being the strongest meanwhile Uppermoon 6 is considered the weakest of the Uppermoons. In almost all time of demons existing, only one Uppermoon has kept his place, and that is Kokushibo who is otherwise known as the second longest living demon in existence just behind Muzan Kibutsuji.

   Below Uppermoon 6 however comes Lowermoon 1, but due to the power divide between the Upper and Lowermoons, the Uppermoons normally don't ever really care enough to truly acknowledge the Lowermoons and may tend to mistreat them or talk down on the Lowermoons due to the Uppermoons all being of higher rank. Technically, Uppermoons all have free reign to do whatever they want with the Lowermoons too due to them being of higher rank. All members of the Uppermoons are so dangerous that unless there's 3 or more Hashira.

6. #6Lowermoon

   Keys: Lower rank 5, Lowermoon 2, Lowermoon 5, Lower rank, Lower rank 3, Lowermoon 1, Lowermoon 3, Lowermoon, Lower rank 4, Lower rank 2, Lowermoons, Lowermoon 6, Lower rank 6, Lowermoon 4, Lower rank 1

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   Being considered to be the lesser half of the 12 Kizuki, the Lowermoons are significantly weaker than the Uppermoons but are still LEAGUES above standard demons, and are incredibly dangerous to any normal demon slayer, it only gets risky for them when hashira get involved, but much like the Uppermoons, the Lowermoons all follow a hierarchy that starts with Lowermoon 1 which is directly below Uppermoon 6 in rank, going all the way down to Lowermoon 6 who is the weakest of all the 12 Kizuki, however unlike the Uppermoons where they aren't too kind with each other, in the Lowermoons all of the members are more 'close' and connected due to the fear of being replaced easily, especially since many lowermoons get easily killed by hashira which result in newer lowermoons being introduced, out of them all however only Lowermoons 2, 4, and 5 have been alive the longest out of all the Lowermoons.

7. #7Demon Slayer Corp

   Keys: demon slayer, Demon Slayer corps

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   Demon Slayer Corps otherwise known as the Demon Slaying Corporation is a large group that isn't recognized by the Japanese Government that serves as the only way for humans to be able to fight off against the demons during the cover at night, the demon slayer corps has been around for almost 900 years fighting Demons to keep humanity safe, and has a very special and specific way to fight against the demons as not anyone can fight demons.

   All members of the demon slayer corps are physically in shape, and the only way for anyone to JOIN the demon slayer corps would be to pass through Final Selection which is where potential demon slayers have to spend a week in a demon infested mountain and slay as many demons as possible while surviving, there's no true limit to who joins the corps however, but they can only join if their bodies are capable of withstanding the harsh training and conditions.

8. #8Breathing Styles

   Keys: total concentration breathing, , Breathing style

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   Breathing styles are the abilities that all demon slayers use to be able to combat demons, however these techniques are very straining to the human body so intense training is required, and that training is called total concentration breathing where demon slayers expand their lung capacity to be able to take in more oxygen which would result in more oxygen entering their blood than the normal person, allowing them to use their body to the fullest potential and use their boosted physical attributes with katanas made out of a special metal that absorbs sunlight allowing them a way to kill demons by decapitating them with said swords.

   The breathing styles themselves however are simply just different styles of swordsmanship and all of them stem from one breathing style, that being Sun Breathing which was the first ever breathing style created, it was from sun breathing that water, fire, stone, air, moon, and thunder breathing were derived from Sun Breathing so that different people with different swordsmanship styles could fight demons. However, as time passed on, even more breathing styles branched off from those five and led to more breathing styles, some examples being how Flower Breathing is derived from water breathing, and how insect breathing is derived from flower breathing which means Insect breathing is loosely connected to water breathing due to associaton, then there's love breathing which is loosely based off of fire breathing and so on so forth. Each breathing style is distinctively different in its movements and tactics.

9. #9Blood Demon Arts

   Keys: blood demon arts, Blood demon art

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   These are abilities that demons receive after eating enough humans, no two demon ever has the same blood demon art however, and blood demon arts range in a wide variety from control over an element such as ice all the way to being able to launch crescent moon shaped 'blades', there is no real limit to just what a demon's blood demon art could be, however there are very rare instances where if a demon has never consumed humans and instead uses another form of energy gaining they will be able to unlock their own blood demon art after gaining enough energy through their own methods.

10. #10Blue Spider Lily

    Keys: Blue spider lily

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    A rare and almost mythical variant of the normal red spider lily, the Blue Spider Lily was the flower that had been used in the unfinished medicine that had turned Muzan Kibutsuji into the first ever demon, thus creating demons as a result, and resulting in Muzan trying to find this flower, for with it Muzan would be able to rid himself and all other demons of their weakness to the sun.

    However this flower is completely unknown to almost everyone, especially due to its blooming cycle, the Blue Spider Lily only grows in secluded forests of Japan and blooms only two times out of the year and during daytime, during every other day of the year and the night the flowers close up.

11. #11Hashira

    Keys: Hashira, pillar

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    The Hashira or Pillars of the Demon Slayer Corps are 9 of the strongest and most skilled swordsmen of all the corps, each Hashira being a master at their own breathing style whether it be one of the first 5 breathing styles created off of Sun Breathing or be it a breathing style of one's own creation such as Serpent breathing. Hashira are considered 'gods' among the other demon slayers, however there can only be 9 Hashira at any given point in time, and as such each Hashira is allowed to pick up a trainee if they so please who will take their place after the Hashira is either retired or killed.

12. #12Tsuguko

    Keys: Tsuguko, trainee

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    Considered to be the only 'special' class of demon slayer, a Tsuguko is a specific demon slayer that a Hashira has picked out to be their replacement if they were to be forced into retirement or if they were killed in action. Due to being picked by a Hashira, their Tsuguko would have to go through training with them at almost all times and even occasionally going on missions with their Hashira to get experience.

    Given that there are only 9 Hashira positions, for the most part there are only ever 9 Tsuguko at the most, unless one of the Hashira decides to have two Tsuguko who the Hashira plans to make the two Tsuguko share their ranking when the Hashira in question retires, but this almost never happens.

13. #13Demon Slayer Ranks

    Keys: Mizunoe, Tsuchinoto, Kanoto, Kinoe, Mizunoto, Kanoe, Hinoe, Kinoto, Hinoto, Tsuchinoe

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    Outside of the Hashira however there are multiple rankings below that Demon Slayers climb up through the form of achievements such as killing off members of the 12 Kizuki or by killing a certain amount of demons such as 20, or even all the way to 100. The ranks go in ascending order and go as follows. Mizunoto to Mizunoe to Kanoto to Kanoe to Tsuchinoto to Tsuchinoe to Hinoto to Hinoe to Kinoto, and then finally the ranking JUST below Hashira; the Kinoe. However due to the high risk of death with most missions, not many Demon slayers ever make it far into the higher ranks like Kinoto or Kinoe.

14. #14Swordsmith Village

    Keys: Swordsmith village, village of swordsmitsh

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    An unknown village that helps supply the Demon Slayer Corps with their nichirin weapons, however due to the intense risk of the demons finding out and deciding to just come to the village and kill all the swordsmiths, the location of this village is kept anonymous. It is such a well-kept secret that not even the Hashira know, as any and EVERY demon slayer must first have a bag placed over their head and then be spun around for 30 seconds before a guide from the Swordsmith village comes to pick them up, revealing no directions so that they remain anonymous.

15. #15Nichirin weapons

    Keys: nichirin flail, nichirin weapons, nichirin sword, nichirin bullets, nichirin blade, Nichirin katana

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    Considered to be the only weapon capable of killing demons outside of Wisteria poisoning. Nichirin weapons as their name implies are all made of nichirin, or otherwise known as Scarlet Crimson Ore or Scarlet Crimson Iron Sand. This special material has the ability to absorb sunlight, which is the only thing capable of nullifying a demon's ability to regenerate and kill them. It's with this ore, that the weapons that demon slayers use get the ability to fully kill demons, as they store in sunlight and when used to behead demons, the stored sunlight stops the demon from being able to regenerate their head and thus results in their death. Due to this, most nichirin weapons need to be held out in the sun for a bit to store up sunlight, or else their effect dampens.

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