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An openly gay, male college student moves in with his female childhood friend and her family (conspicuously young milf, and numerous sisters) to attend university.
The childhood friend feels jilted and annoyed at having her fantasy (of a rekindled childhood friendship blooming into romance) spoiled by the cold fact that protagonist-kun isn’t into her, and doesn’t want to be in her.
So what does heroine-chan do? Does she accept reality and move on? Of course not, where do you think we are? She parades herself and her sisters around the house naked, making up excuses and orchestrating misunderstandings involving the bathroom or laundry day etc. She escalates by inappropriately touching P-kun at dangerous times like on trains or at study group meetings, or replacing his lecture recordings on his dictaphone with audio of herself masturbating.
Drama ratchets up as P-kun develops a crush on another handsome boy on campus, and H-chan proffers to be his wingman, secretly hoping to arrange a throuple between the three of them, or just cuck P to make him jealous.
Is it awful? Yes. Is it a hatecrime? Probably. But there it is, a framework for lots of nudity, embarrassment, inappropriate touching and not-quite-pornography.