After her grandmother, with whom she lived, passes away, Kokoro moves to Tokyo to live with her mother. Her stepfather remarries and suddenly throws her down and rapes her. From that day on, her humiliating training begins. She urinates on the street with a vibrator inserted, and her body is played with behind her mother's back. Before she knows it, Kokoro opens herself up to her stepfather, who shoves his dick into her after being violated by men, and asks for a creampie.