Sakura ARC is thrilled to announce that the Steam store page (Coming Soon) for our upcoming mystery visual novel, 'Kamiya Detective Agency: High School Girl Vanished in The Summer' is now officially live. The game is slated for release in 2026.
Steam Store Page Now Open
- Steam Store Page (Coming Soon): https://store.steampowered.com/app/4682860/
'Kamiya Detective Agency: High School Girl Vanished in The Summer' Official Website:
- 🇯🇵 日本語: https://sakuraarc.com/kamiya/
- 🇬🇧 English: https://sakuraarc.com/kamiya/index_en.html
- 🇨🇳 中文: https://sakuraarc.com/kamiya/index_zh.html
Game Overview
"A Mystery Woven into the Streets of Hakata."
Story
July 2025, summer in Fukuoka.
Kengo Kamiya, a former police detective, has finally opened his long-awaited private detective agency near Hakata Station, alongside his assistant, Hikaru Omuta.
Soon after, their very first client walks through the door.
"My daughter—Saki—has gone missing. Please find Saki."
On the day of the closing ceremony marking the start of summer vacation, a high school girl vanished without a trace. The police, viewing it as a voluntary runaway case with no signs of foul play, took a wait-and-see approach.
But as detective Kamiya digs deeper into the investigation, unsettling rumors and mysterious online videos begin to surface, changing everything.
Featuring photographic backdrops captured on the real streets of Fukuoka combined with AI image generation.
From conducting inquiries at Hakata's tonkotsu ramen stalls to confronting high school girls at Ohori Park and Kego Park, the story unfolds across the authentic backdrop of Fukuoka.
Our mismatched duo of a detective and his assistant will trade witty banter as they navigate web rumors and human greed to chase down the truth of the disappearance.
Character Profiles
- Kengo Kamiya: The protagonist and head of the Kamiya Detective Agency. A 29-year-old former police detective. Equipped with sharp observation skills and logical reasoning, though his detective business is currently dead quiet. Quite handsome.
- Hikaru Omuta: Kamiya's assistant. A 19-year-old ordinary girl with zero previous work experience since graduating high school, possessing only a moderate knowledge of gaming and internet culture. Though her stats as a detective's assistant are modest, her affection for Kamiya is straightforward and she makes no effort to hide it. Stands 140cm tall (self-proclaimed).
- Saki Namihana: The 17-year-old high school girl who went missing. She had turned into a "gyaru" and her social circle changed dramatically starting a year ago. On the day of the closing ceremony right before summer break, she disappeared.
Game Features
Multilingual Support
Utilizing AI translation technology, our Steam store page supports 16 languages (Japanese, English, Simplified/Traditional Chinese, Korean, Russian, Thai, Arabic, and more).
Furthermore, the full game will support 18 languages, adding Arabic and the developer's native Kyushu dialect to the mix.
Be sure to visit the Steam store page to see how the game looks in your preferred language!
17-Language Promotional Videos
To allow everyone to enjoy the world of our game, we have released promotional videos (PVs) with subtitles in 17 languages. (Links for languages other than JP/EN/ZH are unlisted)
[Note for Viewers]
The PVs for each language feature translated subtitles overlaid on the Japanese voice narration. Please note that the in-game footage (UI and text) shown in the videos is from the Japanese development version.
- 🇯🇵 Japanese PV: https://www.youtube.com/watch?v=uBD3cK4A42w
- 🇬🇧 English PV: https://www.youtube.com/watch?v=pQkRB-xdddI
- 🇨🇳 Chinese (Simplified) PV: https://www.youtube.com/watch?v=Yw_WFXXPFm0
🌐 PV Links for the other 14 languages:
Indonesian | Chinese (Traditional) | Vietnamese | Turkish | Thai | Russian | Portuguese | Polish | Korean | Italian | French | Spanish | German | Arabic
Photoreal Novel style
This game uses photographs taken on-location in actual spots across Fukuoka—such as Ohori Park, Tenjin, and Nakasu—for parts of its backgrounds. Furthermore, the vast majority of our production process leverages AI technology.
By combining on-location real-world photography and AI image generation to craft a photographic aesthetic, we present our work under a unique genre: "Photoreal Novel."
System & Worldview
There are no complex systems or exploration elements; it is a pure visual novel progressing solely through text and choices. Your deductions will determine which of the several endings you reach.
It’s an entertaining mystery where you can enjoy the realistic atmosphere of Fukuoka, Japanese internet culture, witty banter between the characters, youth, and unpredictable plot twists.
Note: This game is a mystery visual novel set in modern-day, realistic Fukuoka. There are no supernatural, occult, or sci-fi elements. There is no heavy suspense, grotesque imagery, or jump scares, so even those who dislike horror can safely enjoy it as a mystery. (However, it does contain sexual humor and references to drinking, so we have voluntarily rated it "17+".)
Note: The game footage and UI shown in this article are currently in development and may differ from the final release version.
Production Structure
The developer, "Sakura ARC," is a solo, zero-programming creator with zero followers, zero industry recognition, and completely self-taught IT background. With no previous professional portfolio, they are a completely independent developer whose past experience was merely uploading gameplay videos to YouTube.
This absolute amateur is single-handedly creating this game by having Google's AI agent "Antigravity" directly handle (code) the visual novel engine "Ren'Py."
While the core ideas and plot are entirely human-derived, the scenario was refined through bouncing ideas off the AI. Furthermore, we are challenging a "new form of creation" by fully utilizing AI technology for character graphics, backgrounds, BGM, sound effects, programming, multilingual translation, and website building.
You can read about the journey of co-creation with the AI agent since the start of development, the "production manifesto" born from it, and records of our technical challenges in past articles on this blog. If you are interested in the real behind-the-scenes of new personal game development using AI, please take a look.
- 🔗 SAKURA ARC NEWS & LOGS (Blog Top): https://sakuraarc.com/blog/
Please Add to Your Wishlist
'Kamiya Detective Agency: High School Girl Vanished in The Summer' is currently in active development for a 2026 release.
By registering it to your "Wishlist" on the Steam store page, you will be the first to receive updates on release information and demo availability.
Additionally, your wishlist registration serves as a great encouragement for our development. We appreciate your support!
- Steam Store Page (Wishlist Here): https://store.steampowered.com/app/4682860/
To Media and Creators (Press Kit Information)
We have prepared an "Official Press Kit" containing assets (logos, 1080p screenshots, key visuals, trailers [clean version / multilingual srt included], etc.) that you can use to introduce the game or create articles.
Members of the press and media are welcome to freely download and use the materials from the shared folder below. (Articles created without prior notice are also very welcome!)
- Official Press Kit (Google Drive Shared Folder)
- Press Kit Shared Folder: https://drive.google.com/drive/folders/1H66SIFakmZxo79LE3i1TvcVMWqi64iqf?usp=drive_link
- Press Kit Bulk Download (ZIP): https://drive.google.com/uc?export=download&id=1zpjugLaeYRa5ZbzJHAo5hvQadjPy3Ghc
Contact Us
For inquiries regarding this project or the press release, please contact us via the email address listed at the bottom of the official website, or via Direct Message on our official X (@Hikaru_Omuta).