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Synopsis

After failing his entrance exam, Yuuichi attends a cram school while his absentee father remarries, bringing three new family members into the household: a composed, attractive stepmother Mifuyu, her lively eldest daughter Natsuki, and the quiet younger daughter Akiha. Eager to accept them, Yuuichi finds cohabiting with three women stirs intense sexual tension he struggles to control amid exam pressures. A mysterious parcel introduces a peculiar penlight capable of inducing hypnosis, but it cannot force actions against a person's wishes. Initially, Yuuichi uses it to foster familial harmony, yet his commands progressively grow bolder. He also harbors the desire for the women to bear his child to solidify their family bond, while the stepmother and her daughters, driven by their own physical urges, increasingly pursue greater erotic experiences.