AI Collaborative World Building

Demon Slayer — AI World of Breathing Styles, Demons & the War for Dawn

A complete world generated by AI from the canon of Demon Slayer — 28 atoms: 8 characters, 6 locations, 5 events, 7 rules and 2 factions, plus a playable visual novel and a full art library. The world is not the end point, but the starting point of all creation.

28
Atoms
8
Characters
6
Locations
5
Events
22
Works

Worldview

Taisho-era Japan, where lantern-lit nights belong to demons born from the blood of Muzan Kibutsuji — and where a secret corps of swordsmen fights a war the public must never fully know. Tanjiro Kamado, a kind-hearted boy whose family was massacred and whose sister Nezuko was turned into a demon, joins the Demon Slayer Corps and masters Water Breathing to hunt the monster who started it all, and to find a cure for the sister who still protects humans.

Kindness, found family, and iron resolve clash with immortal hunger: breathing raises the body and blade to superhuman limits, sun-forged Nichirin swords cut demon flesh, and every night is a gamble that humanity's fragile hope — the Corps, the Breathing Styles, the bond between Tanjiro and Nezuko — will outlast Muzan's immortal tyranny and the Upper Rank demons who enforce his will.

Visual style: cel shading, sharp shadows, flat color. Kimi K3 GPT Image 2

Characters (8)

8 characters generated from the canon of Demon Slayer, each with an independent backstory and a Breathing Style of their own. The sprites below were auto-generated by GPT Image 2 and shipped inside the playable visual novel.

CharactersTanjiro Kamado
Tanjiro Kamado
Kind-hearted Demon Slayer who fights to cure his demon sister and avenge his family.
CharactersNezuko Kamado
Nezuko Kamado
Tanjiro's younger sister, a demon who resists her hunger to protect humans.
CharactersZenitsu Agatsuma
Zenitsu Agatsuma
Thunder Breathing swordsman who freezes in fear when awake and fights like lightning when unconscious.
CharactersInosuke Hashibira
Inosuke Hashibira
Wild boar-masked fighter who invented Beast Breathing and thrives on pure combat instinct.
CharactersGiyu Tomioka
Giyu Tomioka
Water Hashira who spared Nezuko and set Tanjiro on the path of a Demon Slayer.
CharactersShinobu Kocho
Shinobu Kocho
Insect Hashira who smiles through grief and kills demons with poison instead of beheading.
CharactersKyojuro Rengoku
Kyojuro Rengoku
Flame Hashira whose blazing spirit lights the path for the next generation of slayers.
CharactersMuzan Kibutsuji
Muzan Kibutsuji
The first demon and progenitor of all others, hunting a way to conquer the sun itself.

Locations (6)

Mountains, mansions, and nightmare architecture — from the mist-wrapped training slopes of Mount Sagiri to the endless corridors of the Infinity Castle. Every location is a stage where the war for dawn is fought, and each carries its own history of blood and hope.

LocationsMount Sagiri
Mount Sagiri
Mist-wrapped training mountain of Sakonji Urokodaki, cradle of Water Breathing disciples.
LocationsButterfly Mansion
Butterfly Mansion
Healing estate of the Insect Hashira, where wounded slayers recover and poisons are refined.
LocationsYoshiwara Entertainment District
Yoshiwara Entertainment District
Lantern-lit pleasure quarter where Upper Rank demons hide behind silk, perfume, and night.
LocationsSwordsmith Village
Swordsmith Village
Secret forest settlement where Nichirin blades are forged and the Corps' steel is born.
LocationsInfinity Castle
Infinity Castle
Muzan's shifting fortress of endless corridors where the final war against the demons unfolds.
LocationsAsakusa
Asakusa
A neon-tinged Taisho entertainment district where Tanjiro first confronts Muzan among crowds.

Events (5)

Massacre of the Kamado Family
Muzan's night raid that kills Tanjiro's family and turns Nezuko into a demon.
Final Selection on Mount Fujikasane
Seven-day trial among wisteria-bound demons that births new Demon Slayers.
Mugen Train Battle
Clash with Lower Rank One aboard a dream-devouring train that costs the Flame Hashira his life.
Entertainment District Battle
Undercover war in Yoshiwara against Upper Rank Six that nearly kills three young slayers.
Raid on the Infinity Castle
All-out Corps assault on Muzan's labyrinth, the final gamble to end the demon age.

Factions & Abilities

FactionsDemon Slayer Corps
Demon Slayer Corps
A clandestine organization of Breathing swordsmen sworn to protect humanity from demons.
FactionsTwelve Kizuki
Twelve Kizuki
Muzan's chosen Upper and Lower Rank demons, each a living catastrophe.
AbilitiesSun Breathing
Sun Breathing
The original Breathing Style from which all others descend, feared by Muzan above all.
AbilitiesWater Breathing
Water Breathing
Flowing, adaptable sword forms that strike like current and tide.
AbilitiesFlame Breathing
Flame Breathing
Explosive, high-commitment forms that burn through enemies with pure offensive force.
AbilitiesThunder Breathing
Thunder Breathing
Lightning-fast single-focus style built on speed that outruns the eye.

World Rules

Breathing Styles
Combat arts that raise body and blade to superhuman limits through specialized respiration.
Demons and Muzan's Blood
Humans remade by Muzan's blood into regenerative predators who burn in sunlight.
Sun Breathing
The original Breathing Style from which all others descend, feared by Muzan above all.
Water Breathing
Flowing, adaptable sword forms that strike like current and tide.
Flame Breathing
Explosive, high-commitment forms that burn through enemies with pure offensive force.
Thunder Breathing
Lightning-fast single-focus style built on speed that outruns the eye.
Twelve Kizuki
Muzan's ranked elite demons, divided into Upper and Lower Moons who share his blood directly.

Works from This World

22 works have been generated from this world — 1 playable visual novel game (Final Selection: Night of Wisteria), 7 character sprites with expression variants, 5 scene backgrounds with a title screen, and 9 cover arts. The world is the source; works are its branches.

Fork This World

This world is public. You can Fork it — inherit all 28 atoms, all characters, locations and rules, rewrite what you want, and publish your own version.

Give Tanjiro a different Breathing Style, replace the Taisho era with a neon future, add a new Upper Rank, swap the ending. The world is your asset libraryrewriting is creation.

Collaborative workflow
Fork world → Edit atom cards → Generate new games/videos/assets → Publish → Others can Fork your version

Model Pipeline

World building · TextKimi K3Claude Opus 5
One sentence → 28 atoms: 8 characters, 6 locations, 5 events, 7 rules, 2 factions.
Art generation · ImageGPT Image 2
Character sprites (auto background-removed), scene backgrounds, game covers.
Video generation · AnimationSeedanceKling 2.5
Title animations, character entrance effects, scene transitions.
In-game dialogue · Real-time narrativeDeepSeek V3Kimi K3
Real-time LLM generates narrative in character voice. Freely switchable.

Asset Prompts

Tanjiro Kamado — sprite source

Full-body visual novel character sprite source image for AVG runtime. One character standing upright in a natural neutral pose, entire body visible from head to shoes, centered with generous margin around hair, hands, clothing, and feet. Plain pure white matte background (#ffffff) for clean cutout; no scenery, no interior, no exterior, no decorative backdrop, no gradient, no shadowy environment, no checkerboard transparency pattern, no pixel grid, no fake transparent background. Demon Slayer anime cel shading: @Tanjiro Kamado, teen boy, wine-red hair, scarred forehead, checkered green-and-black haori, black uniform, calm determined expression, holding a Nichirin sword at his side. Keep face, outfit, silhouette, and color palette. No text, logo, watermark, frame, card border, or UI.

Title background — Wisteria Gate

Cinematic 16:9 anime background, Demon Slayer style cel shading sharp shadows flat color, night mountain gate on Mount Fujikasane, massive cascading purple wisteria flowers framing a wooden torii-like gate, moonlit misty forest path beyond, Taisho-era Japan atmosphere, dark quiet lower third for title text overlay, no characters, no people, no UI, no text, no logos, no watermark, clean scenic illustration

Cover Mugen Train

Anime scenic night steam train racing through moonlit countryside, warm cabin windows glow, dramatic clouds, cinematic atmosphere, empty exterior shot no people, cel shading sharp shadows flat color, no violence no blood

Studio Interior

World, Not Work

In Neta Studio, a world is the beginning of everything. A world contains characters, locations, events, and the rules that bind them — all generated by AI from a single sentence, all referenceable, rewritable, and expandable.

World → Game

Select a storyline from world cards, AI auto-writes game logic, generates art, builds a playable visual novel — just like Final Selection: Night of Wisteria.

World → Video

Generate dynamic videos from world characters and scenes — title animations, character entrances, scene transitions.

World → Assets

Each character auto-generates a sprite, each location auto-generates a background. The world itself is an asset library.

Create from this World

Inherit 28 atoms, rewrite what you want, create your own Demon Slayer.

World: Demon SlayerType: Anime World · Dark FantasyAtoms: 28 (Characters 8 · Locations 6 · Events 5 · Rules 7 · Factions 2)Works: 22 (Game 1 · Sprites 7 · Backgrounds 5 · Covers 9)Models: Claude Opus 5 · GPT Image 2 · DeepSeek V3
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