I'm gang-raped by my son's classmate every day.

Keiko may have spoiled her son Hideaki as more pampered than anyone else. And of course, I didn't know that Hideaki was disliked by his classmates now. One day, Hideaki, whose university's destination was decided on a recommendation, brings his classmate home, saying, "I'll teach you how to study." Keiko could see this as a casual landscape, but in fact, what was left of them was on the verge of explosion at this time.