Reiko Kobayakawa, a married woman living next door, endures both violence and sex from her drunken husband. Her neighbor, Jun'ichi, secretly watches her suffering every day. One day, he spots her on the street and follows her home. Finding her door unlocked, he forces his way inside. Hiding by the window, he is discovered by her—but instead of fleeing, he gives in to his urges and assaults her. This impulsive act drastically alters the course of both their lives, exposing raw desires and desperate circumstances.