Yumi is a married woman who appears to live a happy life with her husband. However, she harbors a secret she can't share with him: binding herself with ropes and posting the photos online. Originally possessing a sensual side, Yumi gradually found herself unable to suppress her growing desires. She reaches out to a bondage master she met through the site, begging him to meet and train her. Her body becomes intoxicated by the pleasure of tight restraints, climaxing deeply and intensely. Torn by guilt and the thrill of betrayal toward her husband, Yumi remains helplessly drawn to the allure of rope, repeatedly plunging into this dangerous affair.