Xiapu Casebook — 霞浦相谈屋 · 事件簿
Play Xiapu Casebook (霞浦相谈屋 · 事件簿) — an interactive school mystery game set in the Xiapu Chronicles world. Investigate four cases at Xiapu High School: an ill-timed broadcast, a letter with vanishing ink, a hidden layer in the culture festival plan, and a firelight at the end of a seaside manor hallway. Click every object, drag real clues onto the deduction board, then choose how much truth to reveal — the consultation room trust meter decides the ending. Free to play in your browser.
Final Product: Xiapu Casebook
Cover
Game cover: Kamo Fuchiko holds the old casebook against her chest while Uno Nae raises a curious hand — the consultation room door and the broadcast room sign wait down the hall. Generated by GPT Image 2 in 16:9 wide.
Gameplay
Actual gameplay: Case 1 — The Ill-Timed Broadcast. Click every object in the broadcast room after school; each one drops a clue into the investigation notebook — but not everything is useful.
Gameplay
Actual gameplay: after the deduction board closes, the real question begins — tell the whole truth, or hand the girl a step down? Every verdict shifts consultation room trust.
Gameplay
Actual gameplay: the deduction board. Drag the real clues from your notebook into the slots and connect the case — wrong links get a shake from Fuchiko herself.
Xiapu Casebook is a playable school mystery game set in the world of Xiapu Chronicles (霞浦纪事). You are the new member of the 相谈屋 — the consultation room at the end of the corridor where students bring the knots they cannot untie. Beside you: Kamo Fuchiko, who can read a person from a six-second pause at the door, and Uno Nae, whose curiosity starts more cases than it solves.
Four cases wait across the school year — a broadcast aired at the wrong hour, a letter whose crucial lines faded into nothing, a culture festival plan with a hidden layer, and a seaside manor corridor where a light burns in a room that is not on the register. Each case runs the same loop: inspect the scene → connect the real clues → decide how much truth to tell. The truth is a knife — how you hand it over matters more than how sharp it is. Every verdict moves the consultation room's trust meter, and the closing assessment changes with how gently — or how bluntly — you solved each case.
Play it now: Xiapu Casebook →
Game Features
- LLM-Authored Narrative — every line of dialogue, every clue and every verdict in the casebook was written by a large language model in the voice of its characters, then orchestrated by the case engine at runtime (deepseek-chat real-time narrative). Replay a case, choose differently — the story shifts around your decisions.
- Four Full Cases — The Ill-Timed Broadcast, The Letter with Vanishing Ink, The Hidden Layer of the Culture Festival Plan, and The Firelight at the End of the Manor Corridor. Each case is a self-contained mystery with its own scene, clues and verdict.
- Click-to-Investigate Scenes — every case scene is full of clickable objects. Each one feeds your investigation notebook — and some are red herrings that are merely present. Fuchiko is watching how carefully you look.
- Drag-and-Drop Deduction Board — connect the truly relevant clues into the slots to form a conclusion. Wrong links get shaken off the board; only a real chain of evidence closes the case.
- The Verdict System — after the truth is found, you choose how much to reveal: the full truth, a gentle step down, or silence. The consultation room trust meter tracks every choice and decides which of three closing assessments you earn.
- Soft Pastel Campus Art — hand-drawn quality soft colored lineart across every portrait and scene, from the sunlit broadcast room to the dim Shirota Manor corridor at night.
- Browser Playable — runs directly in your browser with save/load, case-by-case progression and replayable endings. No download needed.
Character Sprites
Sprite
Kamo Fuchiko (嘉茂渊子) — the consultation room’s calm core. Shoulder-length dark hair, an almost expressionless face, and eyes that read a person from a single pause (transparent PNG, background removed via BiRefNet)
Sprite
Uno Nae (宇野奈惠) — the engine of curiosity. Lively eyes, a mischievous smile, and a hand always raised with the next question (transparent PNG, background removed via BiRefNet)
Sprite
Fuchiko’s in-game soft face — the moment she decides to hand over a step down instead of a verdict
Sprite
Fuchiko’s in-game insight face — the instant a clue clicks into place and the case connects
Sprite
Nae’s in-game curious face — leaning in before the question that starts the next case
Production Process Breakdown
Stage 1: World Buildingclaude-opus-5
AI receives the seed prompt — a five-volume school mystery series set at Xiapu High School — and generates the world of Xiapu Chronicles: 76 atom cards — 21 characters (Fuchiko, Nae, Kyouka, Kirika and more), 14 locations, 17 events, 16 lore anchors and 8 reading perspectives. Each card carries original descriptions, cover art and interconnections.
AI receives the seed prompt — a five-volume school mystery series set at Xiapu High School — and generates the world of Xiapu Chronicles: 76 atom cards — 21 characters (Fuchiko, Nae, Kyouka, Kirika and more), 14 locations, 17 events, 16 lore anchors and 8 reading perspectives. Each card carries original descriptions, cover art and interconnections.
Stage 2: Game Designgpt-image-2
AI designs the casebook from the world’s atoms: four cases drawn from real events — the founding of the divination club, a letter sent to early spring, the secret culture festival plan, and the summer trip to Shirota Manor. It writes the dialogue, the clue chains, the deduction slots and every verdict, then sets the theme: should the truth be told, and will it hurt?
AI designs the casebook from the world’s atoms: four cases drawn from real events — the founding of the divination club, a letter sent to early spring, the secret culture festival plan, and the summer trip to Shirota Manor. It writes the dialogue, the clue chains, the deduction slots and every verdict, then sets the theme: should the truth be told, and will it hurt?
Stage 3: Art Asset Generationgpt-image-2
Character portraits are generated by image models from structured prompts — Fuchiko and Nae each get a full set of in-game faces plus high-resolution character art. Sprites are processed through BiRefNet background removal into transparent PNGs, and the 16:9 game cover is generated by GPT Image 2.
Character portraits are generated by image models from structured prompts — Fuchiko and Nae each get a full set of in-game faces plus high-resolution character art. Sprites are processed through BiRefNet background removal into transparent PNGs, and the 16:9 game cover is generated by GPT Image 2.
Stage 4: Build & Publishdeepseek-chat
The game is built and published with one click, instantly shareable online. The case engine owns the scenes, the deduction board and the trust meter; the AI-authored script keeps the investigation alive, and saves let you replay each case toward a different ending.
The game is built and published with one click, instantly shareable online. The case engine owns the scenes, the deduction board and the trust meter; the AI-authored script keeps the investigation alive, and saves let you replay each case toward a different ending.
- plan-first-avg-creator — AVG visual novel delivery framework
- generate-image — produces art assets (character faces, scene backgrounds)
- background-removal — cuts character sprites into transparent PNGs
Scene Backgrounds
BG
Key art: the after-school campus of Xiapu High — the world where every case begins and every truth is measured
BG
Case 1 scene — the broadcast room after school, where an ill-timed announcement carries a message someone was too afraid to say aloud
BG
Case 2 scene — the consultation room after the culture festival, where a letter’s most important lines have faded away
BG
Case 3 scene — the student council room on culture festival eve, where an old plan hides in plain sight
BG
Case 4 scene — the Shirota Manor corridor at night, where a light burns in a room that is not on the register
Asset Prompts
Character Prompt (Kamo Fuchiko)gpt-image-2
"@嘉茂渊子, Create a square bust portrait avatar for a character relationship network. Character: Japanese high school girl, shoulder-length straight dark hair following old family tradition, beautiful but almost expressionless face, calm observant eyes, slightly old-fashioned aura, neat school uniform with a subtle classical accessory such as a small charm or folded paper bookmark, holding an old occult or classical text close to her chest. Composition: centered bust portrait, facing slightly left, quiet detective mood. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel character portrait, gentle campus mystery atmosphere, warm paper texture, subtle pastel background, no text, no logo, no watermark. Constraints: no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
"@嘉茂渊子, Create a square bust portrait avatar for a character relationship network. Character: Japanese high school girl, shoulder-length straight dark hair following old family tradition, beautiful but almost expressionless face, calm observant eyes, slightly old-fashioned aura, neat school uniform with a subtle classical accessory such as a small charm or folded paper bookmark, holding an old occult or classical text close to her chest. Composition: centered bust portrait, facing slightly left, quiet detective mood. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel character portrait, gentle campus mystery atmosphere, warm paper texture, subtle pastel background, no text, no logo, no watermark. Constraints: no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
Character Prompt (Uno Nae)gpt-image-2
"@宇野奈惠, Create a square bust portrait avatar for a character relationship network. Character: energetic Japanese high school girl, expressive face, lively curious eyes, friendly mischievous smile, short-to-medium soft brown hair with natural movement, school uniform worn casually, one hand raised as if about to ask a question. Composition: centered bust portrait, dynamic angle, warm school afternoon feeling. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel character portrait, gentle campus mystery atmosphere, warm paper texture, subtle pastel background, no text, no logo, no watermark. Constraints: no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
"@宇野奈惠, Create a square bust portrait avatar for a character relationship network. Character: energetic Japanese high school girl, expressive face, lively curious eyes, friendly mischievous smile, short-to-medium soft brown hair with natural movement, school uniform worn casually, one hand raised as if about to ask a question. Composition: centered bust portrait, dynamic angle, warm school afternoon feeling. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel character portrait, gentle campus mystery atmosphere, warm paper texture, subtle pastel background, no text, no logo, no watermark. Constraints: no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
Character Prompt (Insight State)gpt-image-2
"@嘉茂渊子, Create a square bust portrait avatar as the AWAKE / insight state for an interactive eye-toggle web page. Use the existing character design: Japanese high school girl, shoulder-length straight dark hair, old-fashioned calm aura, neat school uniform, subtle classical charm or folded paper bookmark. Expression MUST visibly change from calm neutral to alert insight: eyes clearly open wider and focused, eyebrows slightly lifted but controlled, gaze directed straight at viewer as if she has just solved a clue; mouth still composed but more decisive. Scene: after-school consultation room, faint letter paper and disappearing ink motif, cool blue-white clue light crossing her eyes..."
"@嘉茂渊子, Create a square bust portrait avatar as the AWAKE / insight state for an interactive eye-toggle web page. Use the existing character design: Japanese high school girl, shoulder-length straight dark hair, old-fashioned calm aura, neat school uniform, subtle classical charm or folded paper bookmark. Expression MUST visibly change from calm neutral to alert insight: eyes clearly open wider and focused, eyebrows slightly lifted but controlled, gaze directed straight at viewer as if she has just solved a clue; mouth still composed but more decisive. Scene: after-school consultation room, faint letter paper and disappearing ink motif, cool blue-white clue light crossing her eyes..."
Key Visual Prompt (Light Novel Poster)gpt-image-2
"@嘉茂渊子, @宇野奈惠, Create a light novel key visual poster for a school mystery series titled around a Japanese high school detective club. Scene: shoulder-length straight dark hair calm detective girl Kamo Fuchiko holding an old classical book, beside an energetic expressive friend Uno Nae raising a hand with curiosity, standing in a school courtyard with falling red maple leaves, club building and student council window behind, soft afternoon light, quiet campus mystery mood with a faint hint of unease. Composition: vertical poster, two girls in left-center, ample clean sky space at top for a title, balanced negative space. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel cover illustration, warm paper texture. Text: no text. Constraints: keep both characters’ appearance consistent, no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
"@嘉茂渊子, @宇野奈惠, Create a light novel key visual poster for a school mystery series titled around a Japanese high school detective club. Scene: shoulder-length straight dark hair calm detective girl Kamo Fuchiko holding an old classical book, beside an energetic expressive friend Uno Nae raising a hand with curiosity, standing in a school courtyard with falling red maple leaves, club building and student council window behind, soft afternoon light, quiet campus mystery mood with a faint hint of unease. Composition: vertical poster, two girls in left-center, ample clean sky space at top for a title, balanced negative space. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, clean light novel cover illustration, warm paper texture. Text: no text. Constraints: keep both characters’ appearance consistent, no text, no logo, no watermark, avoid extra fingers, avoid photorealism."
Scene Prompt (Consultation Room POV)gpt-image-2
"@嘉茂渊子, @宇野奈惠, Create a 16:9 cinematic first-frame image for an image-to-video POV scene. Viewpoint: first-person student sitting at a wooden clubroom table inside 相谈屋 after school. The desk must clearly be a fortune-telling setup: a neat spread of handmade divination cards, small paper charms, a simple wooden divination tray, pencils, notebook margins, and a request box at the side. One card is face down near the viewer’s hand, ready to be flipped over normally by hand along its edge. Across the table sits 嘉茂渊子... Composition: close tabletop foreground with the face-down divination card dominant, 渊子 and 奈惠 visible but stable in the background, warm after-school sunset light, no text. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, cinematic school life, gentle mystery atmosphere, anime illustration with subtle film grain. Constraints: no readable text, no logo, no watermark, no fantasy magic effects, no tarot brand symbols, avoid distorted hands, avoid extra fingers, keep character faces consistent with their references."
"@嘉茂渊子, @宇野奈惠, Create a 16:9 cinematic first-frame image for an image-to-video POV scene. Viewpoint: first-person student sitting at a wooden clubroom table inside 相谈屋 after school. The desk must clearly be a fortune-telling setup: a neat spread of handmade divination cards, small paper charms, a simple wooden divination tray, pencils, notebook margins, and a request box at the side. One card is face down near the viewer’s hand, ready to be flipped over normally by hand along its edge. Across the table sits 嘉茂渊子... Composition: close tabletop foreground with the face-down divination card dominant, 渊子 and 奈惠 visible but stable in the background, warm after-school sunset light, no text. Style: soft colored lineart, hand-drawn quality, soft pastel color palette, cinematic school life, gentle mystery atmosphere, anime illustration with subtle film grain. Constraints: no readable text, no logo, no watermark, no fantasy magic effects, no tarot brand symbols, avoid distorted hands, avoid extra fingers, keep character faces consistent with their references."
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