OBA-199 I get gangbanged by my son's classmates every day. Yoko Kurino

Since Yoko began living separately from her husband when he was transferred to another location, her only son, Ken, has begun to behave badly, much to Yoko's distress. Unhappy with everything, Ken's quick-tempered nature has made his classmates annoyed, and he eventually starts a "rebellion." Betrayed by his trusted friends, Ken is so shocked that he transfers to a school where his father is working. But the tragedy doesn't end there, as Yoko is home alone when the doorbell rings...