A son falls in love with his stepmother Hibiki and can no longer control his feelings. He confesses his feelings to her, but is frustrated by the fact that their relationship remains unchanged. One day, his father has to go on a business trip. Then, he sneaks into her bed in the middle of the night and the forbidden incestuous game begins! With his burning love burning intensely, he forgets all feelings of guilt and gets carried away as he impregnates her in an adulterous sex act!