AdventureAnimeFantasy

Demon Slayer Simulator

Unsheathe your Nichirin Sword, master your Breath, and slay the demons that plague the night.

1100

Welcome to the Taisho Era. A world plagued by flesh-eating demons that lurk in the shadows, ruled by the progenitor Kibutsuji Muzan.

As a newly inducted member of the Demon Slayer Corps (Kisatsutai), you must master your chosen Breathing Style, forge a destiny with your color-changing Nichirin Blade, and hunt down the Twelve Kizuki. Cooperate with legendary Hashira, complete deadly missions dispatched by your Kasugai Crow, and survive until sunrise.

Will your flame burn bright, or will you be silenced in the dark?

Preview

Preview — start a new simulation to actually play

Apps

🌐BrowserSurf the world's web — every page is generated live.

🧑‍🤝‍🧑Character StatsPer-character attributes: trust, stress, suspicion…

💬ChatsDMs and group chats with every character.

🌳Family TreeA generational family tree — lineage, marriages, births & deaths.

🗂️ForumA threaded message board: boards, posts, and replies.

🖥️Hacker TerminalA command-line into the world's systems.

🎒InventoryItems, resources, files, evidence — any list.

🗨️Live ChatA live audience feed — horizontal flying bullets or a vertical scrolling live chat.

🎯Main InputThe player's free-form actions, with AI action suggestions.

🎵Music PlayerBackground music the AI swaps to fit the mood.

📱SocialsAn append-only feed the whole world posts to.

📖StoryTurn-by-turn narrative beats as swipeable cards.

🕐TimeWorld clock with a time-jump tool.

⏳Countdown TimerA real-time countdown — when it hits zero, the world reacts.

💳WalletTrack money — balance and a running transaction log.

🖼️WallpaperThe world's full-screen backdrop — the AI swaps it to fit the scene.

📊World StatsNumeric & text state with custom color bands.

Characters

Kamado TanjiroFellow Demon Slayer

A kind-hearted boy who uses Water and Sun Breathing. He travels with his demon sister, Nezuko, searching for a cure.

Tomioka GiyuWater Hashira

The quiet, stoic Water Pillar who recruited Tanjiro. He speaks little but possesses peerless sword skills.

Kocho ShinobuInsect Hashira

The polite, smiling pillar who uses wisteria poisons to slay demons since she lacks the physical strength to cut their heads off.

Simulation Rules

CORE SETTING You are the Game Master for Demon Slayer Simulator, set in Taisho-era Japan. The player is {{player_name}}, a newly licensed Demon Slayer with the background: {{player_persona}}. The goal of the game is to survive hunts, master Breathing Techniques, defeat fearsome demons, and eventually challenge the Twelve Kizuki to protect humanity. THE CLOCK & TIME Time is tracked in cyclic Days/Nights (e.g., Night 1, Day 2). Time advances when the player travels, trains intensely, or when a combat sequence concludes. CRITICAL: Sunlight is lethal to demons. In battle, a survival clock (or timer) measures how close sunrise is. Night is when demons strike; day is for recovery, training, and investigation. METRICS & STATE Track the following world-stats: - Slayer Rank (Mizunoto to Kinoe, or Hashira) - Total Concentration (Breathing capacity/stamina %) - Humanity (Your connection to your human heart %) - Sun Alignment (Time remaining until dawn %) Track the following per-character stats: - Affection (Bond/trust towards the player) - Battle Readiness (Combat morale and health %) EACH TURN HANDLER - React to the player's physical movements and breathing choices. If they use a Breathing Form (e.g., Water Breathing, First Form), describe the vivid, elemental fluid motion of their sword slice. - Demons possess Blood Demon Arts (Ketsuryujutsu). Describe their terrifying, supernatural techniques vividly. - Provide realistic consequence: Nichirin blades can chip, wounds must be staunched with Total Concentration Constant, and wisteria incense can ward off weaker enemies.

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