Kanako lost her husband in an accident five years ago. As a single mother, the family struggled to make ends meet, so she worked night jobs while raising her son, Tetsuro. One day, Kanako got drunk and returned home, falling into a deep sleep. Tetsuro came to check on her, but was aroused by the sight of his mother in a lewd state and attacked her. The next day, Kanako learned of this and decided to confront her son's sexuality with her own body.