BIO SECRET

BIO SECRET

サイレント4 · 2024 · Indie, Sexual Content, Action, Action RPG, Hentai

PC
Mixed63% · 16
Best price
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About BIO SECRET


※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.

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- 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.


\

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

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Not recommended Oct 21, 2024
This game is a buggy mess. I wish I never bought it. I should have put more effort into playing it during the two day window so I could see how much of an awful mess it is so I could return it.
5 found this helpful
Not recommended Jan 4, 2025
5/10 Art is nice but everything else is just okay or worse. Could be worth on sale if you are a fan of resident evil style games but don't expect anything near that level. It's really short and gets boring. I only rate it this high because I liked the creatures, ambiance and atmosphere (and those things could be just template rpg maker stuff. I have no idea). Half the game is you running errands, it's not like you get invested in the mess of a story that is going on. The combat is really basic and enemies are super predictable so that's not interesting either. Took 2 hours to beat but it felt like 2 years... It also has a lot of apparent bugs that make it quite frustrating at times. So that means if you don't have problems with softlocking it might be even shorter than 2 hours which is kind of crazy for the price (yes I am missing like 4 scenes but I don't care enough to find em) I'm getting sick of people calling atmospheric walking simulators a "puzzle". This game has combat so it's not exactly a walking simulator but it's quite close. More often than not it's just spamming the interact button and running into every wall. You don't need a brain to figure these things out. You ju…
2 found this helpful
Recommended Dec 9, 2024
I love silent 4 games, but I can't finish this game due to a glitch in the boss battle. Which means I have 5 scenes I can't unlock without repeating the game all over again. Fix the bug or give me a full unlock option. There are 2 other game breaking glitches, just make sure to spread out your saves and don't save if you die on the outdoor boss. Otherwise, it's an okay game with a really good netorare and corruption story.
2 found this helpful
Not recommended Oct 28, 2024
Never found any lewds as the game froze and had to be restarted.
2 found this helpful
Not recommended May 25, 2025
Not worth the money or at least the full price. There is no button to exit the game or for settings and the buttons too. And for some stupid reason there is cloud save and not settings. There are bugs. Nothing serious, but still. Enemies sometimes reappear for no reason and sometimes several times. There are lots of weapons and leveling up but no enemies. The story is unoriginal and boring with two endings not special and dumb. The scenes are few and there is not much variety. No point in replaying. The game has so few things that it looks like half a game and is downright pathetic, and everything similar to it, and given that it's 2025, it's even more pathetic.
1 found this helpful
Recommended Jun 30, 2026
Great game

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