Akari lives with her husband and son. Her son has started working and they are living peacefully. One day, while cleaning and doing the laundry, Akari goes into her son's room to clean it, and finds his room clothes scattered all over the place, as well as rolled up underwear. Semen is stuck to the underwear and gives off a bad smell. Akari is turned on by the smell, which she hasn't smelled in a long time. She tries to seduce her husband at night, but he turns her down, so she masturbates alone. Her son comes home drunk and finds her and attacks her. In fact, her son's masturbation material is his mother...