Yuna lives with her father-in-law Shinichi at her husband Kouji's parents' house. She has come to Kokoro Shinichi, who is always considerate of her, but behind his kindness lies a wolf's face... Shinichi senses Yuna's frustration as her husband is busy with work and they are not having success with children, and he uses this opportunity to turn Yuna into a sex doll of his liking...