The Yugashima Incident — A Fog-Shrouded Mystery-Horror Game
Final Product: The Yugashima Incident
Cover
Game cover — The Yugashima Incident, generated by GPT Image 2 in 16:9: detective Satoshi Suzusaki on the fog-choked streets of Yugashima as the red torii gate looms through the mist
Gameplay
Actual gameplay: the title screen — "The Yugashima Incident". Private detective Satoshi Suzusaki arrives in fog-shrouded Yugashima to investigate ritualistic deaths; the case already knows him
Gameplay
Actual gameplay: the first scene — "The fog never lifts in Yugashima." Mei Li, the enigmatic innkeeper, stands in the mist as the AI director opens the investigation
Gameplay
Actual gameplay: a live investigation beat — the Constable reports the third family in four months. Choose how to press him: see the scene, ask what the Council knows, or ask about survivors
The Yugashima Incident is a playable interactive mystery-horror visual novel generated from the Shadows of Yugashima world in Neta Studio. Private detective Satoshi Suzusaki steps off the last bus into a village where families are found dead at their dinner tables — eyes placed on saucers — and where the old gods are stirring beneath the earth once more. The case already knows him: it reaches back six years into a past he cannot remember.
Investigate crime scenes, question witnesses, and navigate the trust of four warring factions — the Village Council, the Onmyoji’s Order, the Shadow Market dealers, and the Rebellion — while managing your fraying sanity. Every scene is written live as you play: reply in your own words or pick a suggested move, and the AI director resolves the outcome in the moment.
Play it now: The Yugashima Incident →
Game Features
- Live LLM Narrative — Every scene, witness and narrative beat is written in real time by an LLM as you play. Type any action into the investigation box and the AI director performs the next beat, updates the meters, and moves the case forward — no two playthroughs unravel the mystery the same way (deepseek-v4-flash real-time narrative).
- Free-Form Investigation — Key moments open a freeform input where you can ask witnesses anything, search a room, or follow a hunch. The AI reads your intent and resolves the outcome; honesty builds trust, and recklessness costs you sanity.
- Faction Trust & Sanity Meters — Every decision shifts your standing with the Village Council, the Onmyoji’s Order, the Shadow Market and the Rebellion — and takes a toll on Suzusaki’s fraying mind. Trust opens doors; sanity keeps him whole.
- Branching Mystery — Investigate crime scenes, question witnesses, follow leads and confront the truth of Suzusaki’s forgotten role. Three families dead in four months — and the pattern reaches back six years.
- Cinematic AVG Scenes — Ten fog-drenched scene backgrounds and ten full-body character sprites rendered in Unreal Engine 5 style: the village street, the Shadow Market, the Shrine of the Old Ones, and more.
- Browser Playable — Runs directly in your browser, no download needed. Live LLM dialogue on every scene turn.
Character Sprites
Sprite
Satoshi Suzusaki — neutral: the haunted private detective, trench coat worn thin by six years of forgotten cases (transparent PNG via BiRefNet)
Sprite
Asuka Kashiwagi — neutral: his fiercely loyal secretary, sharp-witted and quietly unshakeable (transparent PNG via BiRefNet)
Sprite
Mei Li — neutral: the enigmatic innkeeper whose knowing smile hides more than she lets on (transparent PNG via BiRefNet)
Sprite
Hiroshi Tanaka — neutral: the reclusive onmyoji, gaunt from decades of arcane study (transparent PNG via BiRefNet)
Sprite
Akira Kuroda — neutral: the charismatic rebel leader who rallies the village against the Council (transparent PNG via BiRefNet)
Sprite
Yumi Nakamura — neutral: the wise village elder, compassionate but steel underneath (transparent PNG via BiRefNet)
Sprite
Dr. Kusanagi — neutral: the otherworldly psychologist with silver hair and hypnotic blue eyes (transparent PNG via BiRefNet)
Sprite
Kenji Saito — neutral: the most notorious dealer in the Shadow Market, dangerous elegance (transparent PNG via BiRefNet)
Sprite
Eiji Nakamura — neutral: the quiet younger brother torn between family loyalty and rebellion (transparent PNG via BiRefNet)
Sprite
Kaito Sato — neutral: the ruthless inquisitor of the Village Council (transparent PNG via BiRefNet)
Production Process Breakdown
Stage 1: World Buildingclaude-opus-5
AI receives a one-line seed prompt — a mystical detective horror set in the fog-shrouded village of Yugashima, Japan — and generates the complete Shadows of Yugashima world: 10 characters, 10 locations, 4 factions, 6 rule systems and 12 lore entries in a single session.
AI receives a one-line seed prompt — a mystical detective horror set in the fog-shrouded village of Yugashima, Japan — and generates the complete Shadows of Yugashima world: 10 characters, 10 locations, 4 factions, 6 rule systems and 12 lore entries in a single session.
Stage 2: Game Design & Artgpt-image-2
AI designs the game from that world: the investigation loop, faction trust and sanity meters, the branching mystery, and all art — 16:9 cover key art, 10 scene backgrounds, and 10 full-body character sprites generated on plain backgrounds and cut out to transparent PNG via BiRefNet.
AI designs the game from that world: the investigation loop, faction trust and sanity meters, the branching mystery, and all art — 16:9 cover key art, 10 scene backgrounds, and 10 full-body character sprites generated on plain backgrounds and cut out to transparent PNG via BiRefNet.
Stage 3: Build & Publishdeepseek-v4-flash
Game built and published with one click, instantly shareable online. A live LLM (deepseek-v4-flash) performs every witness line and narrative beat in real time — the case reads differently every time you play.
Game built and published with one click, instantly shareable online. A live LLM (deepseek-v4-flash) performs every witness line and narrative beat in real time — the case reads differently every time you play.
Scene Backgrounds
BG
Title — Yugashima Fog — the fog-shrouded village at dusk, a red torii gate half-visible through the mist
BG
Crime Scene 1 — a dim family dinner table set with unnerving precision — the third family in four months
BG
Inn Interior — a cozy common room whose shadows feel too deep for comfort
BG
Village Street — a narrow cobblestone lane barely visible through the fog
BG
Council Hall — the stately hall where desperate elders govern under a patron deity mural
BG
Onmyoji Sanctuary — a hidden stone chamber lit by ethereal blue lights and paper ofuda wards
BG
Shadow Market — underground tunnels where forbidden tomes and cursed talismans change hands
BG
Kurai Woods — a dense ancient forest where the quality of light is wrong
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Archives — a dusty records room holding secrets meant to stay buried
BG
Inn Exterior — a solitary two-story inn glowing warm amber in the cold fog
Asset Prompts
Title — Yugashima Fog Background Promptgpt-image-2
"A dark cinematic Japanese horror-noir scene, 16:9 wide. Fog-shrouded rural Japanese village at dusk, narrow streets winding between traditional wooden houses with tiled roofs and a few modern buildings. A red torii gate stands half-visible through the thick mist in the middle distance. Dim amber lantern light glows from a few windows, casting warm pools against the cool blue-gray fog. The atmosphere is heavy, still, and unsettling — a place where something ancient is stirring. Cinematic semi-real rendering, UE5 quality, dark palette of charcoal grays, fog blues, shadow greens, with warm amber accents. No text, no logo, no watermark, no people, no UI elements. Clean background suitable for a game title screen with dark quiet areas for text overlay."
"A dark cinematic Japanese horror-noir scene, 16:9 wide. Fog-shrouded rural Japanese village at dusk, narrow streets winding between traditional wooden houses with tiled roofs and a few modern buildings. A red torii gate stands half-visible through the thick mist in the middle distance. Dim amber lantern light glows from a few windows, casting warm pools against the cool blue-gray fog. The atmosphere is heavy, still, and unsettling — a place where something ancient is stirring. Cinematic semi-real rendering, UE5 quality, dark palette of charcoal grays, fog blues, shadow greens, with warm amber accents. No text, no logo, no watermark, no people, no UI elements. Clean background suitable for a game title screen with dark quiet areas for text overlay."
Crime Scene 1 Background Promptgpt-image-2
"A clean cinematic scene background for a visual novel, 16:9 wide. Interior of a traditional Japanese home, dim and hushed. A low dinner table in the center of the room, set for a family meal — bowls, chopsticks, tea cups — but the arrangement is unnervingly precise. Tatami mat flooring, sliding shoji screens slightly ajar, a single paper lantern casting weak amber light. Dark wood tones, muted shadows, the quality of silence after something terrible. Cinematic semi-real, dark Japanese horror-noir, UE5 quality. No text, no characters, no blood visible, no UI elements, no watermark."
"A clean cinematic scene background for a visual novel, 16:9 wide. Interior of a traditional Japanese home, dim and hushed. A low dinner table in the center of the room, set for a family meal — bowls, chopsticks, tea cups — but the arrangement is unnervingly precise. Tatami mat flooring, sliding shoji screens slightly ajar, a single paper lantern casting weak amber light. Dark wood tones, muted shadows, the quality of silence after something terrible. Cinematic semi-real, dark Japanese horror-noir, UE5 quality. No text, no characters, no blood visible, no UI elements, no watermark."
Shadow Market Background Promptgpt-image-2
"A clean cinematic scene background for a visual novel, 16:9 wide. Underground tunnels beneath a Japanese village — the Shadow Market. Narrow stone passageways lit by sporadic red paper lanterns and the glow of strange artifacts on makeshift wooden stalls. Forbidden tomes, cursed talismans, items wrapped in dark cloth. The atmosphere is claustrophobic, dangerous, secretive — a place where anything can be bought and everything has a price. Deep blacks, blood red accents, low pulsing amber light. Cinematic semi-real, dark Japanese horror-noir. No text, no characters, no UI, no watermark."
"A clean cinematic scene background for a visual novel, 16:9 wide. Underground tunnels beneath a Japanese village — the Shadow Market. Narrow stone passageways lit by sporadic red paper lanterns and the glow of strange artifacts on makeshift wooden stalls. Forbidden tomes, cursed talismans, items wrapped in dark cloth. The atmosphere is claustrophobic, dangerous, secretive — a place where anything can be bought and everything has a price. Deep blacks, blood red accents, low pulsing amber light. Cinematic semi-real, dark Japanese horror-noir. No text, no characters, no UI, no watermark."
Kurai Woods Background Promptgpt-image-2
"A clean cinematic scene background for a visual novel, 16:9 wide. A dense, ancient Japanese forest — Kurai Woods. Twisted black tree trunks, gnarled branches, thorny undergrowth, deep green-black shadows between the trees. Faint fog drifting at ground level. No clear path — the forest does not want you here. The quality of light is wrong, fading to impenetrable darkness beyond the nearest trunks. Cinematic semi-real, dark Japanese horror-noir. No text, no characters, no UI, no watermark."
"A clean cinematic scene background for a visual novel, 16:9 wide. A dense, ancient Japanese forest — Kurai Woods. Twisted black tree trunks, gnarled branches, thorny undergrowth, deep green-black shadows between the trees. Faint fog drifting at ground level. No clear path — the forest does not want you here. The quality of light is wrong, fading to impenetrable darkness beyond the nearest trunks. Cinematic semi-real, dark Japanese horror-noir. No text, no characters, no UI, no watermark."
Mei Li Character Sprite Promptgpt-image-2
"Full-body visual novel character sprite source image for AVG runtime. One character — a beautiful East Asian woman in her 30s, enigmatic innkeeper with an exotic, knowing presence. Long dark hair loosely pinned up, wearing an elegant dark kimono with subtle patterns. Standing upright in a natural neutral pose, entire body visible from head to traditional sandals, centered with generous margin around hair, hands, clothing, and feet. Her expression is calm but unreadable — a faint hint of a knowing smile, eyes that have seen too much. Plain pure white matte background (#ffffff) for clean cutout; no scenery, no interior, no exterior, no decorative backdrop, no gradient. Cinematic semi-real rendering, dark Japanese noir aesthetic, muted cool palette. No text, logo, watermark, frame, card border, or UI."
"Full-body visual novel character sprite source image for AVG runtime. One character — a beautiful East Asian woman in her 30s, enigmatic innkeeper with an exotic, knowing presence. Long dark hair loosely pinned up, wearing an elegant dark kimono with subtle patterns. Standing upright in a natural neutral pose, entire body visible from head to traditional sandals, centered with generous margin around hair, hands, clothing, and feet. Her expression is calm but unreadable — a faint hint of a knowing smile, eyes that have seen too much. Plain pure white matte background (#ffffff) for clean cutout; no scenery, no interior, no exterior, no decorative backdrop, no gradient. Cinematic semi-real rendering, dark Japanese noir aesthetic, muted cool palette. No text, logo, watermark, frame, card border, or UI."
Hiroshi Tanaka Character Sprite Promptgpt-image-2
"Full-body visual novel character sprite source image for AVG runtime. One character — a Japanese man in his mid-40s, a reclusive onmyoji sorcerer. Gaunt frame, pale skin from years spent indoors studying arcane texts, eerie green eyes that seem to see beyond the physical world. Long dark hair tied back loosely, wearing traditional onmyoji robes in dark indigo and black with subtle protective symbols. Standing upright in a natural neutral pose, entire body visible from head to traditional sandals, centered with generous margin. Plain pure white matte background (#ffffff) for clean cutout; no scenery, no interior, no exterior, no gradient. Cinematic semi-real, dark Japanese noir. No text, logo, watermark."
"Full-body visual novel character sprite source image for AVG runtime. One character — a Japanese man in his mid-40s, a reclusive onmyoji sorcerer. Gaunt frame, pale skin from years spent indoors studying arcane texts, eerie green eyes that seem to see beyond the physical world. Long dark hair tied back loosely, wearing traditional onmyoji robes in dark indigo and black with subtle protective symbols. Standing upright in a natural neutral pose, entire body visible from head to traditional sandals, centered with generous margin. Plain pure white matte background (#ffffff) for clean cutout; no scenery, no interior, no exterior, no gradient. Cinematic semi-real, dark Japanese noir. No text, logo, 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 V4.
One-click generation — Officially tuned skills drive every step: world building, character design, art generation, game packaging. World fork resource sharing.
Community-first — Users build unlimited worlds, all public worlds can be forked, remixed, reimagined.
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