Two students, Tanaka and Yamada, come to their teacher's house to study overnight. The two are entranced by the sex appeal of the teacher's wife, Natsumi. At night, Natsumi begs her husband for sex, but he ignores her. Tanaka, who is watching, masturbates in front of her and gives her a blowjob. The next day, Natsumi has sex with Tanaka out of sight of others. Natsumi's promiscuous sexuality continues as she has sex with both students, ignoring her husband who has gone out on urgent business.