One year after losing her husband, Rei lives alone with her son. Her son deeply cherishes his mother, and upon discovering her soiled underwear in the laundry basket, he repeatedly masturbates while sniffing them. As time passes, Rei begins a new romantic relationship. When her son finds out, he becomes furious, yanks off her skirt, rips away her panties, and forcefully touches her body. The relationship between mother and son grows increasingly complicated.