OBA-173 My son's classmate gang-rapes me every day. Sayuri Nakauchi

Sayuri lost her husband at an early age and is raising her son Takeo single-handedly. Takeo doesn't have a particularly conspicuous rebellious period, and Sayuri thinks that she should continue this modest life forever... However, one day, Takeo's classmate Koji comes to the house. Koji, who was aggravated by trouble with Takeo in a relationship with a woman, had a strong hatred for Takeo. Koji goes home without doing anything that day, but the next day he shows up at Sayuri's side with a bad friend.