Kaori has been living alone since her husband passed away. When she fell ill, her daughter and son-in-law looked after her, and they decided to live together because they felt it would be safer for her. Kaori, despite her age, feels excited about the presence of a young man, even though he is her daughter's husband. One day, her daughter has to go on a business trip. The couple have sex, knowing that she won't be able to see them from the next day. Kaori hears the noise and becomes excited. She finds a time when she is alone and releases her frustration by masturbating. That night, her daughter's husband comes home after drinking. He falls asleep in the living room. Kaori tries to wake him up so that he can go to bed in the bedroom, but she notices his large erection...