Akiko is a married woman living in the room next door. Her husband has a bad drinking habit and is abusive, so she has sex with him. Junkichi, a man who lives next door, peeks into her life every day. One day, he sees her on the street and follows her. The door to her room is unlocked, so Junkichi gets in. However, Junkichi is found by the wife, who is hiding by the window. Junkichi attacks the wife, but...