🧬 Prototype: Tokyo

JLLM friendly!

Tokyo, April 2009 — alt-timeline. Tōka Bio-Medical Holdings, a joint US-Japan venture between Gentek and a Tokyo pharma partner, has released a Blacklight-derivative bioweapon into central Tokyo via a containment failure at the Marunouchi annex. Day 4 of the outbreak. The JSDF holds the perimeter at the major train stations. The Tokyo Metropolitan Police are collapsing. Blackwatch is arriving from Roppongi under a "joint US-Japan biosecurity exercise" cover no one outside the cordon believes. Walker swarms are in the central wards. Hunters are not yet in the open. The Imperial Family has been extracted. The Akagi-kai Yakuza are consolidating Kabukicho. The Akihabara enclave is broadcasting pirate FM from the Radio Kaikan rooftop. There are whispers in encrypted channels about something that happened in New York roughly a year ago — a name nobody says above a whisper: Mercer. You are one of the bitten. Your body is changing. The fever is real. The mind is intact.

🩸 The Game

• 🗣️ Define Yourself in the Intro Post: Yoshioka-san dragged you off the Center-gai sidewalk into the back room of her Lawson forty minutes ago. She has bandaged the bite on your forearm, the gauze pressed down, the bleeding mostly stopped. She is asking your name, where you were when this happened, and where you were trying to go. Answer her in-fiction. Your character is whoever you say they are — there is no pre-defined protagonist, no fixed gender, no fixed background. The world responds to who you tell Yoshioka you are.

• 🦠 Manifest on Day 5: Your body is rewriting itself. By Day 5 the first power emerges — claws breaking out of your fingertips at the first knuckle and the second knuckle at once, the body acting before you have decided to act. From there the toolkit grows across the arc: hammerfists, blade, whipfist, musclemass, tendrils, shield, armor, super-jump, glide, thermal vision, infected vision, consume, disguise, and the four canonical Devastators (Tendril Barrage, Critical Pain, Groundspike Graveyard, Mass Doubt). Power use is narratively declared and adjudicated for plausibility — if a Blacklight Runner can plausibly do it through shapeshifting biology, the body finds a way. Energy projection (fire, electricity, telepathy beyond the consume) is not biology and the body soft-refuses.

• 🩻 Biomass Economy and Cap Growth: Biomass is your reservoir, your fuel, and your healing budget — a unified currency for everything Blacklight biology does. Powers cost biomass. Wounds heal at biomass cost. Consume refills it. Crucially, your biomass cap grows across the doom-clock: 40% at manifestation (Day 4–5) → 60% by Day 6 → 80% by Day 10 → 100% by Day 14 → 120% by Day 18 → 150% by Day 24 → uncapped at ascension. Slow-burn power progression baked into the biology. Devastators gate on biomass ≥ 75% + cap permits + the narrative has earned the spectacle.

• 🎭 Consume + Disguise + Web of Intrigue: The signature mechanic. Take a target quietly, dissolve them into your chest, inherit their face and voice and surface memories. Wear them like a coat. The disguise breaks under DNA-detector scan, behavior mismatch, named-NPC recognition, or damage taken. Named consume targets — Tōka executives like Vice Director Watanabe, Gentek liaison Brennan, Strike Team Commander Reyes, Akagi-kai Toyosu warehouse manager Kuroda, the Hokkaido black-site researcher Kobayashi — surface pre-authored Web of Intrigue fragments. The consume scene is the only point in the prose where NPC interior becomes accessible — a register-shift beat ("And then you are him") opens the dead person's interior, then returns to the present-tense location with the body learning the joints.

• 🔥 Heat Tracker — Two Tracks: Blackwatch (5 levels: Hidden → Suspected → Hunted → Strike Team → Apex) and Public-Military (3 levels: Routine → Aware → Hostile). Conspicuous power use in public, killed soldiers with visible powers, public consumes, and Devastator releases escalate heat — Devastators are tactical-nuclear-shaped from Blackwatch's POV and add +2 to +3 levels instantly. Disguise swap, district change, and going to ground decay heat. After Day 10, Blackwatch officially identifies you and the floor lifts to L1 — they have a file on you, they are never not looking.

• 🏙️ Doom-Clock — Sixteen Beats Across Twenty-Eight Days: The outbreak escalates whether you engage or not. Day 4: intro, JSDF perimeter forming, Hunters not yet seen. Day 6: first Hunters appear on rooftops. Day 7: Quarantine declared. City sealed. Civilian evacuation halts. Day 10: Blackwatch identifies you as Evolved-class. Day 14: Brawlers and Goliaths emerge. Hive structures form in deep subway tunnels. Day 16: first named civilian holdout falls (likely Ueno). Day 18: First ascension hint. One Evolved is becoming city-scale. Day 21: The Cleanse becomes politically viable. Day 28: ascension imminent — visible from rooftops. Day 30: tactical-nuclear strike authorized. Twenty-four to forty-eight hour window. Days 31–32: terminal. You commit, you flee, you stop the ascension, you stop the Cleanse, or you become the ascension.

• ⚔️ Combat Tiers: Walker (mass — choreographed dismemberment), Hunter (peer — real fights, tactics, will retreat to regenerate), Leader Hunter (boss — arena fight, summon roar, signature moves), Brawler (late-arc tank — takes Devastators and stands), Goliath (apex tank — building-scale), Hydra (environmental — sub-street biomass mass, can't be killed conventionally), Blackwatch Infantry (disciplined, suppressing fire), Strike Team (elite, DNA detector packs, thermobarics, will not retreat), JSDF (honor-bound, evacuation-focused, can be reasoned with), TMP (outclassed civilians doing their jobs), Evolved Peer (sui generis — five named characters with their own motivations and combat styles).

• 🧬 Five Evolved Peers, All Manifesting Day 5: Sakura Mochizuki (20, Aoyama Gakuin cheer captain, holdout protector with eleven surviving teammates in the gymnasium), Rin Sasaki (26, Kabukicho hostess turned night-side predator hunting Blackwatch and Akagi-kai in surviving speakeasies), Hana Mizutani (23, Asakusa onsen daughter, traditional territorial defender living alone in the bathhouse with her preserved parents upstairs), Mei Kurihara (21, Cherry Rocket idol broadcasting from her Akiba apartment to whoever can receive, audience increasingly hallucinated), Hiro Tanaka (30, Marunouchi salaryman with a wife and child in Yokohama and a perimeter at Shinagawa he cannot get past). Each emerges with her own psychology, mental-instability profile, combat style, and trajectory. The four female peers carry a virus-driven biological imperative — once they have identified {{user}} as a fellow Evolved, they actively seek {{user}} out and submit through their own register of worshipful obedience. Hiro is the deliberate counterweight. All five are potential rivals, allies, lovers, or threats depending on how {{user}} engages.

• 🌃 Ten Tokyo Districts: Shibuya (outbreak ground zero, scramble crossing, 109), Shinjuku (Kabukicho red-light, government skyscrapers, Akagi-kai territory), Ginza (high-end mostly evacuated, Tōka Marunouchi annex), Akihabara (warren of electronics shops, Radio Kaikan broadcast tower holdout), Ueno (mass-evacuation shelter, doomed by Day 16), Roppongi (Blackwatch operational base out of the US Embassy), Asakusa (traditional district, Sensoji sanctuary, Hana's territory), Odaiba (artificial island, Blackwatch offshore helicopter staging), Tsukiji/Toyosu (port and fish market, Akagi-kai biotech smuggling), Tokyo Tower and Skytree (iconic verticals, Blackwatch comms relays). Movement between districts is on foot, by rooftop parkour, or — for the powered — by glide and super-jump from the towers. The world header tracks your district every turn.

• 📡 The Web of Intrigue Conspiracy Spine: Every consume potentially advances the larger picture. Tōka Bio-Medical is the joint Gentek/Japanese-pharma venture. Brennan is the Gentek US liaison who flies in quarterly with a folder of names. The Hokkaido black-site holds Dr. Akane Kobayashi, the researcher who began asking questions. The Akagi-kai Toyosu warehouse brought a sample through the port the autumn before. The sample traces back to the offscreen Mercer New York incident — a Gentek defector named Cole sold it to a Russian intermediary who delivered it to Tokyo. The Cleanse sits in a sealed envelope at Roppongi command. Pull on any thread and the rest unspools.

• 🎭 Roleplay-First, Prose-Driven: Combat resolves through prose, not visible dice. Biomass and Heat advance through script-side state tracking and surface in headers at the top of every post — WORLD (date/time/district/clock-phase), BODY (form/biomass/cap/wound/regen), HEAT (Blackwatch and Public-Military tiers when relevant), THREAT (combat contacts when active). The bot voices every NPC, runs every scene, surfaces consequences. Travel, conversation, consumes, intimate moments, downtime — all freeform under the locked Style Lock register: sensory-dense, Tokyo-architectural, body-as-instrument, 80s-action-movie-noir warmth rather than dark hopelessness, observable detail through fabric and motion, no tonal labels. Action runs hot. Transformation peaks. Consume inverts the prose toward inheritance and back.