Beautiful married woman Rin experiences her first sexual encounter with a man she met through a dating site at a hotel. From that impulsive first step, their meetings gradually increase in frequency, until the man begins showing up at her home. Rin is bound up tightly and subjected to strict verbal and physical discipline, slowly becoming completely obedient to him. Contrary to her usual personality, Rin harbors a hidden masochistic side, and as a master-servant relationship forms, she grows increasingly submissive and eager for pleasure under her master's control. The ecstasy derived from being tied up consumes her mind and body, creating an addiction she cannot escape. Her transformation vividly reflects the profound changes taking place within her.