Marriage life that looks happy. Yumi's secret that she can't tell her husband. It was to post pictures of herself tied up on an image site. Unable to control her own carnal desires, Yumi asks a bondage master she met on the site to meet and train her. Yumi, intoxicated by the pleasure of bondage, reaches deep and intense orgasms. Despite her worries about her adultery towards her husband, Yumi continues her risky encounters for the sake of the rope.