現像されない三日間
Free · play online in your browser, no download
Three days before the school festival, the photo club's president has vanished. A choice-based mystery novel with nine time slots, six endings and code written almost entirely by Claude Code.
Official site vannangames.com, verified Nov 3, 2026. Play address linked from the game's page on VANNAN GAMES (vannangames.com), the developer's own site, which the developer's Zenn article links.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleasedFree
Runs in a desktop or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About 現像されない三日間
現像されない三日間 is a free choice-based mystery novel for the browser, in Japanese. Three days before a high school's culture festival, Akari Himino, a third-year and the president of the photo club, stops coming to school, leaving the phone at home; the police do not act because the family has told them there is nothing criminal about it. What is left is a locked darkroom in the old school building and one roll of undeveloped film. You play the club's only junior member, who decides to find the missing president before the festival. The three days are split into nine slots (morning, lunch break and after school), and each slot lets you go to one place only, so you cannot visit everywhere; some places turn up nothing, and you only find out by going. Clues are physical evidence and testimony, and testimony can be wrong or a protective lie. Two companions, Hiyori, a childhood friend, and Natsume Tōno, the president's best friend, build trust the more slots you spend with them, and whoever has enough trust is beside you on the third night. There are six endings: three where you solve it (with Hiyori, with Natsume or alone) and three where you do not. The developer says every clue needed for the truth can be found in one playthrough and no outside knowledge is required. One playthrough takes 40–60 minutes and all endings three to four hours; progress autosaves in the browser. It is set in the same town as the developer's time-loop novel 四十秒の交差点, at a different school. Per the developer, kawaiy, the code is almost all written by Claude Code; the illustrations were generated with ChatGPT and the music with Suno, and the site credits the scenario and development to kawaiy. Plain HTML, CSS and JavaScript with no framework. Free in desktop and phone browsers.
How it was built
VerifiedIn a Zenn article (23 Aug 2026) about building the eight-game VANNAN GAMES site in 34 days, the developer lists the division of work as “Claude : コード、ドキュメント、シナリオの下書き、レビュー” (Claude: code, documents, scenario drafts, reviews) and writes “コードはほぼClaude Codeに書かせています。” (I have Claude Code write almost all of the code.) This game was released on 21 Aug 2026, two days before the article, and is one of the eight. Check and generator scripts run from a Claude Code Stop hook after every agent reply and again on GitHub Actions. The developer kept for themselves whether a game is fun, the consistency of the shared town (what each story is allowed to reveal) and decisions about what not to do.
- DeveloperA production note on the site (17 Sep 2026) opens: “このサイトは、コードを書く作業の大半をAIに頼んで作っています。” (This site is built by leaving most of the code writing to AI.) — VANNAN GAMES
Generated the illustrations; the game's page credits “イラスト：ChatGPTで生成” (illustrations generated with ChatGPT). Per the Zenn article, image requests are kept as files in the repository, one code block per image.
Plain HTML, CSS and JavaScript with no framework, bundler or transpiler, served as static files from Tencent Cloud EdgeOne Pages; progress is saved in the browser's localStorage. The story is held in a separate script from the engine. Claude Code writes almost all of the code under checks run by a Stop hook; ChatGPT generates the illustrations and Suno the music.
- Engine / framework
- None (vanilla JavaScript)
- Languages
- JavaScript
- Team size
- 1 (solo)Developer ReportedVANNAN GAMES
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“コードはほぼClaude Codeに書かせています。”- Eight browser games in 34 days: Claude, ChatGPT and Suno, and what could not be handed off (Zenn, Japanese)
- Game page on VANNAN GAMES (Japanese)
Verification notes: AI use and the workflow come from the developer's Zenn article (23 Aug 2026, 02:03 JST), re-read through Zenn's API on 8 Nov 2026; it links vannangames.com. The article covers the whole site (eight games on 23 Aug 2026) and does not name this game, so the Claude Code statement is applied to each of its games; this game was released on 21 Aug 2026 per the site's updates log, so it was one of the eight. A production note on the site (17 Sep 2026) also says most of the code writing is left to AI. Story, structure, endings, play time, release date (公開日 21 Aug 2026, last updated 27 Sep 2026) and credits (シナリオ・開発：kawaiy; illustrations generated with ChatGPT, BGM with Suno) come from the game's page, and the rules from the in-game guide, all read on 8 Nov 2026. The site's operator page names kawaiy (個人) as the operator. The article says Claude drafts scenario text; the site credits the scenario to kawaiy; both are recorded. The English title is our translation; there is no official English title. The game's scripts (engine and story) contain no AI service addresses; the site loads Google Analytics. The Japanese interface was observed (lang="ja"); no other language option was found. The game was not played.
Development history
Released on VANNAN GAMES.
The developer's Zenn article describes building the eight-game site with Claude Code writing almost all of the code.
DeveloperZenn (kawaiy)
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
Browser (official site)
Free in modern desktop and phone browsers, with no install or account; progress autosaves in the browser and can be exported from the site's backup page. The site accepts optional support through OFUSE.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
Sales & revenue (all platforms)
Browser game — there are no downloads to count.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| 34日でブラウザゲーム8本のサイトを立てた。Claude・ChatGPT・Sunoの分担と、丸投げできなかったもの Zenn (kawaiy) · Japanese | Devlog | Aug 23, 2026 | Nov 3, 2026 |
| 現像されない三日間｜選択式推理ノベル｜VANNAN GAMES VANNAN GAMES · Japanese | Official site | Aug 21, 2026 | Nov 3, 2026 |
| 更新情報｜VANNAN GAMES VANNAN GAMES · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| ルールを決めた8日後に、自分でそれを破った——AIへの指示を4つのレイヤーに分けた｜VANNAN GAMES 制作ノート VANNAN GAMES · Japanese | Devlog | Sep 17, 2026 | Nov 3, 2026 |
| VANNAN GAMESについて｜運営者情報 VANNAN GAMES · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) VANNAN GAMES | Official site | Not confirmed | Nov 3, 2026 |
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