Two students, Tanaka and Yamada, come to the teacher's house to study overnight. That night, Tanaka peeks at Mizuki, who is being ignored by her husband and is indulging in masturbation. The next day, Mizuki seduces Tanaka and has sex with him. Then, while her husband is asleep, she sneaks into the boys' futon and becomes immersed in love affairs with them!