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

Since her husband passed away, Kaoru has been raising her son, Tatsuo, by herself. Kaoru was concerned whether Tatsuo is an introvert and is getting along well with his friends, perhaps because he is an introvert. One day, Tatsuo brings a classmate home... Kaoru can't hide his joy at the presence of his classmate Tatsuo brings for the first time, but the joy is easily betrayed. Tatsuo was bullied by his classmates. And then, the evil deeds of her classmates reach out to Kaoru...