Kanna is a submissive mother already trained by a man she calls Master. One day he orders her to offer her adult daughter Oto as another slave, and Kanna agrees after realizing that refusal would mean abandonment. While Oto is away, Kanna seduces her adult boyfriend, then reveals her true nature by having wild bondage sex with him in front of her daughter. Oto has inherited her mother’s masochistic streak, and double bondage training gradually awakens her talent for becoming an obedient rope slave.