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Synopsis

When Suuichi's planned private summer study lodge is destroyed by a meteorite, he accepts his sister Nanami's invitation to stay in the dormitory for the break. An accidental encounter in the bath involving Nanami leads three other female dorm residents to confront him, and each proceeds to instruct him in their own intimate ways; part of the arrangement includes him addressing them with the honorific "nee-chan." The story follows the tense, erotic interactions that unfold between Suuichi and the women of the dorm during the summer period. The anime adapts the adult PC game developed by Atelier Kaguya Honky-Tonk Pumpkin.