Living with her husband Koji at his family home, Yuna shares a household with her kind and attentive father-in-law, Shinichi. Gradually opening up to his warmth and care, she remains unaware of the cold, calculated intentions hidden beneath his gentle demeanor. Noticing Yuna's growing sexual frustration due to her husband's busy schedule and their struggles to conceive, Shinichi begins manipulating her—determined to reshape her into the perfect sex doll embodying his deepest desires. Unaware of his sinister agenda, Yuna slowly falls under Shinichi's control, drawn deeper into his web of domination and incestuous desire.