The solitary bondage master TENMA HARU controls a dangerous rope play... Mao Hamasaki is lured by him after meeting at a bar somewhere in Tokyo, suddenly overcome by drowsiness and falls asleep. She awakens in a confinement basement. Inside a prison cell surrounded by iron bars, Mao pleads for mercy but is mercilessly treated as a sacrifice. Through chaotic training, Mao gradually descends into a dark beast. This "Mao Hamasaki" is an existence unlike anything seen before.