Who Made Psycho-Sleuth? Developer and Publisher

Who Made Psycho-Sleuth? Developer and Publisher

Psycho-Sleuth was developed by PHOSEPO, an independent studio based in Taiwan, and published by Thermite Games and Smilegate. The game launched for Windows on November 4, 2026, and is sold on Steam at $17.99 in the US. According to NookGaming, PHOSEPO is a Taiwanese developer and the publishing duties are handled by Thermite Games together with Smilegate. The Steam store page lists PHOSEPO as the developer and both Thermite Games and Smilegate as publishers.

The Studio Behind the Game

PHOSEPO is best described as an indie team rather than a large studio. NookGaming notes the Taiwanese origin of the developer, which places it in the same broad indie scene as other narrative-driven mystery titles from the region. No official developer website is currently listed for the team, so the most reliable place to follow news and updates is the game's Steam page and its community announcements.

The Publishers

Two publishers share credit on the store listing:

• Thermite Games, which also appears as the publisher on review aggregator entries.
• Smilegate, credited alongside Thermite Games on Steam.

According to Digg's summary of Gematsu's report, Thermite Games and PHOSEPO announced the November 5 launch, with the game arriving on PC through Steam and the STOVE store. The launch was announced for November 5, which is the date the game's own release materials use.

Scope of Production

The development team's Steam announcements describe a project that expanded considerably during production. The game spans five chapters, and the release announcement materials mention a script exceeding 500,000 characters, more than 10,000 lines of Japanese voice acting, 40 CGs, and a soundtrack of 50+ original BGM tracks. NookGaming's review notes that the game "takes a while to really hit its stride," while describing its different murder scenarios as elaborate and the addition of psychological manipulation powers as a fairly novel layer to unravel with each case.

Where to Find It

Psycho-Sleuth is available on Windows through Steam, with the STOVE store also carrying it per Digg's report. A free demo covering Chapter 1 and the setup of Chapter 2 remains available on Steam even after the full release. Full audio support is offered in Japanese, while text options cover English, Japanese, Simplified Chinese, Traditional Chinese, and Korean. The store page also lists a wide range of accessibility and comfort features, including full controller support, adjustable difficulty, and the ability to save anytime.

If you want the shortest answer: PHOSEPO developed it, and Thermite Games and Smilegate published it.

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• Psycho-Sleuth Demo: What's Included and Is It Free?
• Psycho-Sleuth Languages: Audio, Subtitles and Text