52-year-old married woman Yumi has committed a sin she can't tell her husband, and as punishment, she is held captive in a man's house. She is subjected to various perverse demands, including bondage, exposure, and lewd acts with a whip. Initially, Yumi could do nothing but endure, but gradually she becomes aware of her own body and begins to accept pleasure. As her painful days continue, she awakens to a new self and starts surrendering herself to this pleasure.