Windowsクトゥルフ神話TRPGを遊んで学べるADV
The story is simple, the protagonist, Kousaka, a transfer student is invited to enter a club by one of his classmate Miko, the theology club.
But this is only a facade, the club in question is actually Miko along with Izumi another classmate and a senior Nina playing Call of CTHULHU.
[From Hadler's review]
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