Kanako lost her husband in an accident five years ago. Struggling to make ends meet as a single mother, she raised her son, Tetsuro, while continuing to work night jobs. One day, Kanako returns home completely drunk and falls into a deep sleep. Tetsuro, coming to check on her, sees his mother in a lewd state, becomes aroused, and attacks her. The next day, upon learning the truth, Kanako decides to face her son's sexuality using her own body.