ADA Mission: Harbor Ghost — Bungo Stray Dogs: Yokohama Interactive Fan Game
Play ADA Mission: Harbor Ghost — a Bungo Stray Dogs: Yokohama interactive fan game where you join the Armed Detective Agency on a one-night case. Question the Agency’s strangest detective, follow a weretiger’s instincts, and survive a Port Mafia shadow in the fog. Free in your browser, no download.
Final Product: ADA Mission: Harbor Ghost
ADA Mission: Harbor Ghost is a playable interactive visual novel set in Bungo Stray Dogs: Yokohama — a modern harbor city where the gifted carry abilities named after books. A sealed crate vanishes from Yokohama Harbor under ability-warped fog, and you are a provisional field agent of the Armed Detective Agency.
The story is written live as you play: follow Dazai’s vague briefing, trust Atsushi’s uneasy instincts, and watch for the Port Mafia shadow that wants the same cargo — and a different kind of justice. Every question, lead, and choice redraws the night.
Play it now: ADA Mission: Harbor Ghost →
Game Features
- Live LLM Narrative — every scene, clue, and line of dialogue is written in real time by an LLM as you play. No two investigations of the missing crate play out the same (deepseek-chat real-time narrative).
- Branching Detective Case — ask Dazai what was really in the crate, trust Atsushi’s unease, or push straight to the harbor — your calls shift Agency Trust, Underworld Heat, and Case Progress.
- Faithful BSD Cast — Atsushi, Dazai, and Akutagawa take the stage with full-body sprites and abilities named after their books: Beast Beneath the Moonlight, No Longer Human, Rashomon.
- Noir Yokohama Art — cel-shaded scenes with sharp ink linework and cool teal and blood-crimson lighting, from the Agency office to the fog-wrapped docks.
- Character Sprites & Expressions — six hand-tuned expressions across three agents, cut to transparent PNGs for clean stage presence.
- Browser Playable — runs directly in your browser, no download needed. Live LLM dialogue on every page turn.
Character Sprites
Production Process Breakdown
AI receives the seed prompt "Build an adventure world based on Bungo Stray Dogs" and generates the Bungo Stray Dogs: Yokohama world — 75 atom cards: characters (24), locations (16), events (16), abilities (8), factions (4), rules (2).
AI designs the game from atom cards: writes the case rules, designs scene flow, and generates every art asset. Each sprite was generated with a full-body sprite prompt on pure white, then background-removed to a transparent PNG via BiRefNet.
Game built and published with one click, instantly shareable online. Live LLM (deepseek-chat) improvises dialogue in each character’s voice as the case unfolds.
Scene Backgrounds
Asset Prompts
"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… Character: Atsushi Nakajima from Bungo Stray Dogs — late teens male, silver-white hair with black tips, heterochromatic eyes (one gold one purple), Armed Detective Agency waistcoat uniform with black trousers and shoes, earnest anxious neutral expression. Keep face, outfit, silhouette clear. No text, logo, watermark, frame, card border, or UI."
"Full-body visual novel character sprite source image for AVG runtime… Character: Osamu Dazai from Bungo Stray Dogs — tall lean young man, dark brown messy hair, bandage-wrapped neck and arms, tan trench coat over black vest and white shirt, dark trousers, soft mysterious smile, relaxed posture. No text, logo, watermark, frame, or UI."
"Full-body visual novel character sprite source image for AVG runtime… Character: Ryunosuke Akutagawa from Bungo Stray Dogs — pale young man, short black hair, sharp cold eyes, black long coat with high collar and white tips, dark clothing, thin frame, cold stern expression. No text, logo, watermark, frame, or UI."
"Dark urban anime illustration interior background: Armed Detective Agency office, wooden desks, scattered case files, tall windows overlooking night Yokohama city lights, warm lamp light mixed with cool teal street glow, sharp ink linework, empty room no people, cinematic literary noir, no text no watermark."
"Dark urban anime illustration exterior background: Yokohama harbor night docks, shipping containers, wet pier boards, distant freighter lights, cool teal and blood-crimson reflections on black water, sharp ink linework, empty scene no people, cinematic literary noir atmosphere, no text no watermark."
"Dark urban anime illustration interior background: dim Yokohama bar lounge with wood counter, low amber lamps, rain-streaked window showing neon street, empty stools, cool teal and crimson noir palette, sharp ink linework, no people, cinematic literary atmosphere, no text no watermark."
Why Choose Neta Studio
Professional — Cloud harness system supports the full workflow from world building to game publishing, all running in the cloud with no local setup. Stable access to the latest models: Claude Opus 5 · GPT Image 2 · DeepSeek V3
One-click generation — Officially tuned skills drive every step: world building, character design, sprite cutouts, art generation, game packaging, and instant publishing to a shareable link.
Community & IP-first — Adapt any world or start fresh from a single sentence. Keep your sprites, prompts, and worlds — remix them into new games anytime.
Studio Interior
Start Creating
This game was generated by Neta Studio AI from a single sentence. The world took minutes. The game took minutes. You can do it too — adapt this world or start fresh from any IP. No coding required, free to start.