Serina begins living with her father-in-law Saburo, who had been alone in the countryside. When her apologetic husband worries about the arrangement, she smiles and says she cannot let his aging, dispirited father continue living alone. On the first night, Serina refuses sex because Saburo is in the house, but her husband insists it will be fine. Before long, the moans she cannot suppress reach Saburo’s room.