In the dark depths of a dimly lit room, Naho, tormented by pent-up desire, repeatedly brings herself to climax through masturbation. A shadow that has silently watched her for years finally begins to move. Fixated on her back, it slowly speaks up. "Mom... are you teasing me, shaking that big ass? Let me comfort you instead of Dad." Trembling, her buttocks quivering with each word, Naho edges closer toward orgasm. The shadow, having observed her like this for countless years, finally takes action. That single sentence marks the beginning of a new story.