While enduring her stepfather's brutal acts, Nonoka finds herself experiencing pleasure from her sensitive body. Bound by ropes, she becomes even more aroused, reacting with lewd wetness. After discovering her mother's innocent form being spied on by her stepfather, Nonoka develops an interest in tight bondage and begins masturbating. Caught by her stepfather, she is scolded and punished. From then on, Nonoka is gradually trained deeper into submission. Witnessing her stepfather forcefully penetrating her mother's core twists Nonoka's mind further. She begins to feel pleasure from being tied up, eventually falling into becoming a rope slave●.