Working as an insurance sales agent, Niina Nishimura was a woman with a deeply masochistic side. However, as her sales performance declined and her superior—also her husband, Kashiwagi—suddenly announced their divorce, she found herself mentally broken and desperate. In her despair, she turned to a man from her past: her former lover during college, the one who had first turned her into a slave, her true Master. After being disciplined by him again for the first time in years, Niina rediscovered the pleasures of submission and began craving even more intense, dangerous training. She plunges headfirst into a world completely detached from reality... #EiyoP