https://www.dlsite.com/books/work/=/product_id/BJ01383306.html
https://book.dmm.co.jp/product/4488749/k740aplst06269/
https://www.cmoa.jp/title/292042/

[Synopsis]

''You can only try once, but if you clear them all, you'll get 1 million yen. Why don't we all try it?''
A group of four good friends are lured by the prize money and decide to try the popular interactive puzzle solving game [SOWING].
''Let me show you to the venue now. Please come this way...''
A suspicious-looking guide leads them to a set that is said to be a mountain lodge.
Apart from the prize money, it seems like a normal interactive game...
But as soon as the game starts, a mysterious gas fills the air and the four lose consciousness.
And then...
''Nooooo!''
''What's going on!?''
When they wake up, they are stripped naked and restrained.
''You will now play four games.''
''The rules are simple! If you can withstand our erotic torture until the end of the time, you win.''
However, if you lose...(͠≖ ͜ʖ͠≖)

It's a matter of whether you cum or not and the pleasure-climax game, in which the girls' lives are at stake, begins...!

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