My Son's Classmates Gangrape Me Everyday Sayuri Ikuina

Sayuri lost her husband early and is raising her son Takeo on her own. Takeo doesn't go through a particularly noticeable rebellious phase, and Sayuri humbly hopes this life will continue forever... But then one day, a boy named Koji, a classmate of Takeo's, comes to the house. Koji, who had a conflict with Takeo over a woman, harbors intense hatred for Takeo. Koji goes home without doing anything that day, but the next day he shows up at Sayuri's place with his bad friends...