Night after night, the lewd cries of pleasure echo from his parents' bedroom. It's a voice that an adolescent son shouldn't want to hear, but it sticks in his ears and won't go away... Forbidden feelings begin to grow within the son as he discovers that his beloved mother has a woman's face in Hitomi. The son decides to get involved in his parents' attempt to have a child, so that he can take the feminine side of his mother for himself. He will fill his mother with his sperm and drive out his father's sperm. That way, he will be able to monopolize his mother's love and body. Or so the son believed.