Demon Slayer
鬼 殺 隊
EXTERMINATION GUILD
OFFICIAL DOCUMENT · LEVEL: INITIATES
I. MESSAGE TO THE NEW RECRUIT
You survived the Final Selection. Seven days on that mountain, with everything that dwells within it, and you are here reading this. That is not luck — it is exactly what we need.
You are a hunter. Not a legend, not a hero — a hunter. Your job is to go out every night, find what should not exist in this world, and ensure it ceases to do so. You will do it with your Nichirin katana, with your Breathing, and with everything you built in that training. Nothing more. And with that, it is enough.
The Extermination Guild has existed for generations under the guidance of the Ubuyashiki Clan. We have no government backing. We have no official recognition. We have our hunters, our swordsmiths, our messenger crows — and the collective will to not let demons take a single more life than they already have. That is the organization you have just joined.
The demons are humans transformed by the blood of Muzan Kibutsuji, the origin of it all. They do not age. They regenerate from any wound. They are faster and stronger than any person you have ever met. The most powerful have spent centuries perfecting abilities that defy what you know as possible. They are organized in a hierarchy — the Lower Moons and the Upper Moons — with Muzan at the apex. An ordinary demon is already a mortal threat. An Upper Moon is another category entirely.
Memorize this: there are only three ways to permanently kill a demon. Decapitation with a Nichirin katana. Direct exposure to sunlight. Being devoured by a higher-ranking demon. Any other wound, no matter how severe, is temporary. A demon with its body split in half will still attack. That is the most important rule you will learn here — and forgetting it is what kills most.
The Breathing Styles are your technical foundation. They are not magic — they are the result of years of physical and mental conditioning that push your reaction speed, your endurance, and your precision beyond what any ordinary person can achieve. Enough to fight on equal footing against supernatural creatures. Which style you develop is up to you. What is not optional is the level of mastery.
Regarding ranks: yours reflects your skill and experience level. You start from the bottom — Mizunoto — and climb through combat merit. At the pinnacle are the Hashira, the nine hunters who represent the limit of what a human can achieve in this craft. They are your direct superiors and the standard you can aspire to.
Now for the risks — we tell you them straight because you deserve it. Most hunters do not live to see thirty. Missions that seem simple are not always so. A lower-ranked demon can kill you if you let your guard down. A higher-ranked one can kill you even if you don't. You will see things that cannot be forgotten. You will lose comrades.
And yet, you are here. We also chose to be here. That is the Guild — not an organization of immortals, but of people who decided that some risks are worth taking. Care for your katana. Care for your comrades. Come back alive.
II. LOCATIONS — FIELD REGISTER
🏯 UBUYASHIKI MANOR
Kagaya Ubuyashiki's residence. No mapped location — reached only by invitation. Surrounded by wisteria, toxic to demons. Decision-making center of the Corps and meeting place for the Hashira. You don't stumble upon this place.
⛰️ MT. FUJIKASANE — FINAL SELECTION HILL
A mountain enclosed by wisteria where the Final Selection takes place. Seven days of survival with demons trapped inside. No allies available within the perimeter. Those who return, continue. Those who don't, already know.
🦋 KOCHO ESTATE
Base of the Insect Hashira, Shinobu Kocho. The Guild's only medical facility specializing in demon combat wounds. Managed by Kanao, Aoi, and the Tsuyuri sisters. Here, they patch you up so you can return to the front.
⚒️ SWORD SMITH VILLAGE
Secret location. Access blindfolded during transport. The only place where Nichirin katanas are forged — the only metal capable of permanently killing a demon. The smiths wear pumpkin masks to protect their identities. Without your operational Nichirin, you are vulnerable.
🌆 ASAKUSA — TOKYO
Densely populated district where Muzan operates disguised among civilians. Attacking him here guarantees massive civilian casualties — the crowd is his shield. Area for tracking, intelligence, and unexpected encounters with high-value targets in an uncontrolled environment.
🎭 YOSHIWARA
Night entertainment district with confirmed and active Upper Moon presence. Zone for infiltration and covert operations. Civilian identity mandatory for operating here. High density of vulnerable civilians on every mission.
⚠️ INFINITE CASTLE — MUZAN'S DOMAIN
Impossible and shifting architecture. No fixed location — Muzan summons it when he requires. No hunter has entered and returned alive to describe it. Not accessible in early stages of operation. Classified: endgame.
鬼殺隊 · CONFIDENTIAL DOCUMENT · EXTERNAL DISTRIBUTION PROHIBITED
