A middle-aged couple of relatives who came to Tokyo to go to school and take care of their daughter, an uncle whose desire awakens when a young woman enters the house, and a daughter who sees sex with his wife gets excited, masturbates, and is frustrated by his daughter. The uncle who noticed it hides from his wife and aims at the daughter and enjoys the plump young body, and the wife who noticed it was not allowed to forgive the daughter who likes sex and made the young man throw it in.