Who Am I エラーコード：九十九
Wake up with no memory in the city of Toan and piece yourself together by talking to people and trading the words you can keep.
Links go to the official store or developer page. Last verified Nov 4, 2026.
Steam lists Frequent Violence or Gore and General Mature Content. The developer's note: “Please note that this work contains violent expressions and elements.” The demo's note also mentions sexual elements. (Steam)
No ads are shown on this page.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- View on SteamSteamReleased$4.99
Download through the Steam app. A free Steam account is required.
Desktop · Steam
About Who Am I エラーコード：九十九
Who Am I エラーコード：九十九 (Who Am I: Error Code 99) is a Japanese-language game that its store page calls an action novel game. The protagonist wakes up injured in an unfamiliar place and wanders through Toan, a city of desire and despair, looking for who they are. You click icons on the map to talk to people, save words that come up in conversations and bring them to other people, who may then answer differently; because of the injuries you can hold only three words at a time, so you have to choose which ones to keep. The store page warns that the world is distorted and that regaining your memories may mean great suffering. The creator, Misato of 奥羽電影 (Ouou Eiga / OUDENEI), says the game was first made to promote their own cyberpunk novel エラーコード：九十九 (Error Code: 99), the artwork is drawn by the creator and the background music is by Wounded Healer. The developer's Steam AI disclosure says the game is programmed using AI. A paid game on Steam for Windows, released 29 Sep 2025 (30 Sep in Japan), in Japanese only; a free demo has been on Steam since Jan 2025.
Screenshots and art
Who Am I エラーコード：九十九 key art · Steam store artwork
How it was built
Partially verifiedThe developer's Steam AI disclosure, in full: “This game is programmed using AI.” (Japanese store page: このゲームは、AIを使用してプログラミングされています。) It names no tool and gives no share. The creator's Steam posts say the artwork was drawn by the creator and the background music was composed by Wounded Healer, so the disclosed AI use is in the programming.
Not described beyond the one-sentence Steam disclosure that the game is programmed using AI. The creator's posts say the artwork was drawn by the creator, the music is by Wounded Healer and the story comes from the creator's own novel. In Jan 2025 the full version was planned for March with three maps, four endings and a large amount of text; it came out in Sep 2025, and the developer said before release that a planned change to the character portraits could not be made for now.
- Engine / framework
- Not disclosed
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“This game is programmed using AI.”Verification notes: The AI claim rests on one sentence, the developer-written AI disclosure on the game's Steam page (re-read in English and Japanese on 4 Nov 2026): “This game is programmed using AI.” It names no tool and gives no share, so the tool is recorded as undisclosed; the wording says the programming was done using AI, with no “assisted” qualifier. The artwork credit (“drawn by the creator (me)”) and the Wounded Healer music credit come from the 10 Feb 2025 Steam post; the novel link from the 20 Jan 2025 post, and the Kakuyomu page shows エラーコード：九十九 by みさと. Demo download milestones (500 a week after the demo's release, more than 1,000 by 28 Sep 2025) are the developer's own figures for the free demo, so they are kept in history and not recorded as download metrics for the game. The release post gives 30 Sep 2025 at midnight Japan time; the Steam store API shows 29 Sep 2025 (US time). Price, platform and Japanese as the only supported language from the Steam store API; the store page also carries an English description. On 4 Nov 2026 the store page showed no user reviews, so no review metrics are recorded. Steam lists Frequent Violence or Gore and General Mature Content; the full game's note mentions violent expressions, the demo's note violent and sexual elements. The Twitch, YouTube and X accounts were not checked. Nothing describes AI content generated during play.
Development history
A free demo is released on Steam.
OfficialSteamThe developer reports 500 demo downloads in the first week and plans the full version, with three maps and four endings, for March.
DeveloperSteam (Who Am I エラーコード：九十九 news)The developer reports more than 1,000 demo downloads, sets the release for 30 Sep at midnight Japan time and says a planned change to the character portraits cannot be made for now.
DeveloperSteam (Who Am I エラーコード：九十九 news)Released on Steam for Windows at US$4.99 (30 Sep in Japan).
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.
Steam
US$4.99 on the Steam store API (US region) on 4 Nov 2026. Windows only. A free Steam demo (app 3423290, released 14 Jan 2025) is listed on the store page.
Not publicly available: Concurrent players, Steam reviews, Positive Steam reviews, Estimated owners, Copies sold, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Who Am I エラーコード：九十九 on Steam (store page incl. AI Generated Content Disclosure) Steam · Japanese | Store page | Not confirmed | Nov 3, 2026 |
| Who Am I エラーコード：九十九 Demo on Steam (store API entry) Steam · Japanese | Store page | Not confirmed | Nov 3, 2026 |
| Thank you for 500 downloads of the trial version Steam (Who Am I エラーコード：九十九 news) | Devlog | Jan 20, 2025 | Nov 3, 2026 |
| PV "Primal Desire" is now available. Steam (Who Am I エラーコード：九十九 news) | Devlog | Feb 10, 2025 | Nov 3, 2026 |
| Regarding Demo Downloads Hitting 1,000 and the Release Date Decision Steam (Who Am I エラーコード：九十九 news) | Devlog | Sep 28, 2025 | Nov 3, 2026 |
| エラーコード：九十九（みさと） Kakuyomu · Japanese | Official site | Not confirmed | Nov 3, 2026 |
Similar games
