Kyoko is a hardworking married woman supporting her household through side jobs at home. Despite growing weary of her womanizing husband, she has endured their marriage. Into her life steps her brother-in-law, Oki, who treats her with a tenderness unlike her husband, gradually drawing her heart toward him. Meanwhile, Kyoko becomes aware of her father-in-law's suspicious presence, who seems to sense the growing bond between her and Oki. Exhausted by her husband's verbal abuse and violence, Kyoko finally reaches a breaking point and makes a fateful decision.