Free Major Update Released for Hentai Prison

TOKYO, JAPAN – JUNE 24, 2025.

Today Shiravune released Update 1.0.2 for the international version of HENTAI PRISON, adding the highly anticipated “Himeru Yamagishi Mini-Scenario”.

Representing approximately an hour of bonus content, this post-story episode features the clean-mouthed but filthy-minded prison guard Himeru Yamagishi as its central heroine and unlocks after fully completing the game's main story. It is exclusive to the R18 version of the game.

When the patch is active and the preconditions are met, an additional “Route 6” page will appear on the the SCENARIOS menu on the title screen. Players can begin the new scenario directly through this menu.

As of June 24, 2025, at 10:00 JST, this update is now included wherever the R18 version of the game is sold and as part of the complete R18 conversion update available for free from https://patch.moe.

ABOUT SHIRAVUNE

Shiravune is a Tokyo-based localization team dedicated to bringing Japanese games to fresh audiences in English and Chinese. We work with developers large and small to help them deliver their stories to players around the world. Since our founding in 2019, it has been our pleasure to expand our catalog to include the seminal 90s dating sim Dōkyūsei: Bangin' Summer, the crossdressing rom-com Otome * Domain, the hyperkinetic rush that is Marco & The Galaxy Dragon, PC ports of the acclaimed Utawarerumono series of story- driven tactics RPGs, and much more! Find our games primarily on Steam and Johren, or join us on Twitter and Discord for the latest announcements.

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