I am absolutely in love with this game! Its like a much more forgiving, less harsh Degrees of Lewdity and its so well written! I'm so glad to have found this game!
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It's also an adult school simulator. However, the school the MC is in is clearly a middle school curriculum (despite the characters being over 18 because legal reasons), and it's largely about the MC being raped repeatedly. I actually wouldn't say the game is particularly similar at all beyond "adult school simulator," but it definitely was one of the dev's inspirations (I imagine in particular to make something better).