BIO SECRET

About this game

※All characters in this game are 18 years of age or older

*If receiving an error message for missing DLLs, please confirm that the VC2010, VC2012, VC2013, and VC2015 redistributables are installed.For Windows 7 and Windows 8 users, updating to the latest OS version via WindowsUpdate may be required before the rebistributables can be installed.*

Horror Action-Adventure Game with Heroine Cuckold

Friday after school, Aoki took his photography club friends Rin and Shinjo to an abandoned mansion.
There were rumors about the mansion on Mr. Kokotsu, scaring people away.
The three students were not afraid and entered the mansion. anyway.
After they got stuck in the sudden storm, two of them heard Shinjo screaming.
Shinjo went missing, then somebody kidnapped Rin.
The PC booted up itself and started playing a video of Rin and a middle-aged man in a lock-up.

[Characters]

- Osamu Aoki
A devoted fan of abandoned buildings.
A member of the photography club and taking pictures of abandoned buildings.


- Rin Sayama
Started dating Aoki a half years ago. Gets easily frightened.
Gets stuck in an abandoned mansion and......




- Makoto Shinjo
Another member of the photography club.
Good friends with Aoki but feeling awkward around Aoki and Rin.




- M
An ominous man who traps Aoki and his friends in the mansion.




[System]

This is a horror action-adventure game.
Fight against bio monsters with short-ranged (knife, axe), long-ranged (guns), and explosive weapons (grenades).
Art gallery and scene gallery are available.

Most XXX scenes feature cuckold (NTR).
The heroine is voiced.

Arts: 21 Pattern + Variations
Events: 21 Variations
Endings: 2 Variations
Heroine Voice Actor: Miki Honda

Latest news

• Announcements·4 Mar 2026Official

  Patra and the Erotic Dungeon 3/13 on sale at 20% discount!

  https://clan.fastly.steamstatic.com/images/38431062/76a5a1476c19491c3d3549d48a2f2ae35a14d3c4.png News from Wasabi Entertainment! "Patra and the Erotic Dungeon" will be released on 3/13! Check out the store page for more info! https://store.steampowered.com/app/3422980/ Join Wasabi Entertainment's steam page for all the latest info! ↓↓↓Click here to see Wasabi Entertainment's past titles↓↓↓ https://store.steampowered.com/app/3835980/ https://store.steampowered.com/app/3367320/ https://store.steampowered.com/app/3386200/ https://store.steampowered.com/app/3227350/ https://store.steampowered.com/app/3130080/ https://store.steampowered.com/app/2659870/ https://store.steampowered.com/app/2659850/ https://store.steampowered.com/app/2659860/ https://store.steampowered.com/app/1965280/ https://store.steampowered.com/app/2164630/ https://store.steampowered.com/app/2056150 https://store.steampowered.com/app/1963740/ https://store.steampowered.com/app/2107150/ https://store.steampowered.com/app/2120870 https://store.steampowered.com/app/2098120/ https://store.steampowered.com/app/1964670/ https://store.steampowered.com/app/1901450/ https://store.steampowered.com/app/1934360/ https://store.steampowered.com/app/2024890/ https://store.steampowered.com/app/2052080/ https://store.steampowered.com/app/1894370/ https://store.steampowered.com/app/1997130 https://store.steampowered.com/app/1989840 https://store.steampowered.com/app/1931710 https://store.steampowered.com/app/1747300 https://store.steampowered.com/app/1995280 https://store.steampowered.com/app/1994450 https://store.steampowered.com/app/1892700 https://store.steampowered.com/app/1836520 https://store.steampowered.com/app/1607170 https://store.steampowered.com/app/1963060 https://store.steampowered.com/app/1684480 https://store.steampowered.com/app/1500100 https://store.steampowered.com/app/1886150 https://store.steampowered.com/app/1855760 https://store.steampowered.com/app/1989820 https://store.steampowered.com/app/18646...
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• Announcements·15 Oct 2025Official

  "Lythia: Sigil of Lust" is Now Available on Steam! Limited-Time 30% Off!

  https://clan.fastly.steamstatic.com/images/38431062/f8a400949a35a03816dcdf6578116e9fbeff4d07.png https://store.steampowered.com/app/3835980/_/ Thank you for waiting! The new title, "Lythia: Sigil of Lust", from our sister publisher CrossRoadsRPG, is now available for purchase! As a launch sale, you can purchase it at 30% off for the first 14 days from the release date. Don't miss this opportunity to play!
  Read full article on Community Announcements (gn2038)

• Announcements·4 Oct 2025Official

  "Lythia: Sigil of Lust," from our sister publisher "Cross Roads RPG" has been set for October 15th!

  https://clan.fastly.steamstatic.com/images/38431062/f8a400949a35a03816dcdf6578116e9fbeff4d07.png Thank you for your continuous support! We are excited to announce that the release date for the new title, "Lythia: Sigil of Lust," from our sister publisher "Cross Roads RPG" has been set for October 15th! https://store.steampowered.com/app/3835980/ To celebrate the launch, the game will be 30% off for two weeks as part of the Launch Sale! Don't miss this opportunity to grab a copy!
  Read full article on Community Announcements (gn2038)

• Announcements·8 Sept 2025Official

  「Bessie's Milk Delivery」 Now On Sale ! 20% Discount

  https://clan.fastly.steamstatic.com/images/38431062/20ff9e4aa03a7031c2a6b8b294caac60ff50f127.png Thank you for your waiting. It's out today,9/8! Please have a play with it. Check out the store page for more info! https://store.steampowered.com/app/3367320/ Join Wasabi Entertainment's steam page for all the latest info! ↓↓↓Click here to see Wasabi Entertainment's past titles↓↓↓ https://store.steampowered.com/app/3835980/ https://store.steampowered.com/app/3386200/ https://store.steampowered.com/app/3227350/ https://store.steampowered.com/app/3130080/ https://store.steampowered.com/app/2659870/ https://store.steampowered.com/app/2659850/ https://store.steampowered.com/app/2659860/ https://store.steampowered.com/app/1965280/ https://store.steampowered.com/app/2164630/ https://store.steampowered.com/app/2056150 https://store.steampowered.com/app/1963740/ https://store.steampowered.com/app/2107150/ https://store.steampowered.com/app/2120870 https://store.steampowered.com/app/2098120/ https://store.steampowered.com/app/1964670/ https://store.steampowered.com/app/1901450/ https://store.steampowered.com/app/1934360/ https://store.steampowered.com/app/2024890/ https://store.steampowered.com/app/2052080/ https://store.steampowered.com/app/1894370/ https://store.steampowered.com/app/1997130 https://store.steampowered.com/app/1989840 https://store.steampowered.com/app/1931710 https://store.steampowered.com/app/1747300 https://store.steampowered.com/app/1995280 https://store.steampowered.com/app/1994450 https://store.steampowered.com/app/1892700 https://store.steampowered.com/app/1836520 https://store.steampowered.com/app/1607170 https://store.steampowered.com/app/1963060 https://store.steampowered.com/app/1684480 https://store.steampowered.com/app/1500100 https://store.steampowered.com/app/1886150 https://store.steampowered.com/app/1855760 https://store.steampowered.com/app/1989820 https://store.steampowered.com/app/1864650 https://store.steampowered.com/app/1720040 https://sto...
  Read full article on Community Announcements (wasabiinfomation)

• Announcements·3 Sept 2025Official

  Bessie's Milk Delivery 9/8 on sale at 20% discount!

  https://clan.fastly.steamstatic.com/images/38431062/20ff9e4aa03a7031c2a6b8b294caac60ff50f127.png News from Wasabi Entertainment! "Bessie's Milk Delivery" will be released on 9/8! Check out the store page for more info! https://store.steampowered.com/app/3367320/ Join Wasabi Entertainment's steam page for all the latest info! ↓↓↓Click here to see Wasabi Entertainment's past titles↓↓↓ https://store.steampowered.com/app/3835980/ https://store.steampowered.com/app/3386200/ https://store.steampowered.com/app/3227350/ https://store.steampowered.com/app/3130080/ https://store.steampowered.com/app/2659870/ https://store.steampowered.com/app/2659850/ https://store.steampowered.com/app/2659860/ https://store.steampowered.com/app/1965280/ https://store.steampowered.com/app/2164630/ https://store.steampowered.com/app/2056150 https://store.steampowered.com/app/1963740/ https://store.steampowered.com/app/2107150/ https://store.steampowered.com/app/2120870 https://store.steampowered.com/app/2098120/ https://store.steampowered.com/app/1964670/ https://store.steampowered.com/app/1901450/ https://store.steampowered.com/app/1934360/ https://store.steampowered.com/app/2024890/ https://store.steampowered.com/app/2052080/ https://store.steampowered.com/app/1894370/ https://store.steampowered.com/app/1997130 https://store.steampowered.com/app/1989840 https://store.steampowered.com/app/1931710 https://store.steampowered.com/app/1747300 https://store.steampowered.com/app/1995280 https://store.steampowered.com/app/1994450 https://store.steampowered.com/app/1892700 https://store.steampowered.com/app/1836520 https://store.steampowered.com/app/1607170 https://store.steampowered.com/app/1963060 https://store.steampowered.com/app/1684480 https://store.steampowered.com/app/1500100 https://store.steampowered.com/app/1886150 https://store.steampowered.com/app/1855760 https://store.steampowered.com/app/1989820 https://store.steampowered.com/app/1864650 https://store.steampowered.com/app/1720040 https...
  Read full article on Community Announcements (wasabiinfomation)