Misako is a mother who runs a massage parlor. She lives with her son Takuo. Takuo is determined to move to Tokyo and go to a vocational school. One day, Takuo witnesses Misako having sex with one of her regular customers, and when he learns that the man is going to take care of his tuition, Takuo is upset. His jealousy that he doesn't want his mother to belong to anyone leads to sexual desire...