Nagisa Airi continues to accept her stepfather's desires as a substitute for her late mother. In a father-son household where love and hate swirl, she feels a sense of immorality as she offers her vagina to him in a closed room with no way to escape. The sight of her writhing in agony, held in her stepfather's strong arms and trying to suppress her voice as he thrusts into her, is both tragic and intensely erotic. The uncensored camera carefully depicts the girl's process of descent, as she sucks her stepfather's seed into her womb and gradually becomes addicted to the pleasure. A cruel yet beautiful drama of parent-child incest, in which the family structure is distorted by humiliation and pleasure.