Five years ago, Kanako lost her husband in an accident. She struggled to make ends meet and continued working night jobs while raising her son Tetsuro alone. One day, Kanako returned home drunk and immediately fell into a deep sleep. Tetsuro, who came to check on her, saw his mother in a lewd state and was overcome with desire, assaulting her. The next day, upon learning the truth, Kanako resolved to confront her son's sexuality using her own body.
