さよなら、夏のキミ
A very short Japanese romance novel game with command choices and nine endings, built by Claude Code.
Official site conditionyellow.net, verified Nov 3, 2026. Linked as the game from the developer's own note.com post (2025-06-21). The play page itself shows no author credit, so the domain's owner is not independently confirmed.
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 さよなら、夏のキミ
A short Japanese romance visual novel played by choosing commands; the game page gives a play time of about 5 to 10 minutes and nine endings. The developer, oyaryo, describes themselves as a non-engineer and says Claude Code built the browser game in HTML, CSS, JavaScript and Node.js from a script written with Claude Opus 4 and images made with Google AI Studio's Imagen. They say the whole process took less than an hour. It is playable free in the browser on conditionyellow.net.
How it was built
Partially verifiedThe developer says they asked Claude Code to build a smartphone-friendly browser game in HTML/CSS/JavaScript + Node.js from a prepared script and images, then kept approving Claude Code's prompts (pressing Y) until it was finished.
The developer says the game script (a 5 to 10 minute command-select novel on the theme of the title) and English image prompts for each scene were written in a Claude chat with Claude Opus 4.
Scene images were generated with Imagen in Google AI Studio, per the developer's post. Not a coding tool.
Script and image prompts from Claude Opus 4 chat, images from Imagen, then Claude Code built the game while the developer approved its prompts. The developer says it took less than an hour from script to finished game.
- Engine / framework
- Not disclosed (HTML, CSS and JavaScript with Node.js)
- Languages
- HTML, CSS, JavaScript
- Team size
- Not disclosed
- Initial build time
- Under an hour, from script to finished gameDeveloper Reportednote (oyaryo)
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
Verification notes: AI use and play link from the developer's note.com post (Japanese). Play time and ending count from the game page, which has no author credit or AI mention; the link to the developer rests on the post alone. No release date is stated; 2025-06-21 is the post date. Game not played through by us.
Development history
Developer publishes a note.com post saying the game was built with Claude Code, with a link to play it.
Developernote (oyaryo)
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)
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
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Not currently ranked.
No player reviews yet.
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Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| 非エンジニアがClaude Codeで超ミニノベルゲームを作った話。 note (oyaryo) · Japanese | Devlog | Jun 21, 2025 | Nov 3, 2026 |
| さよなら、夏のキミ conditionyellow.net · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) oyaryo | Official site | Not confirmed | Nov 3, 2026 |
