On the surface, Naisako (Tanmi) is a young, responsible and beautiful doctor, but behind her back, she has an amazing secret that can't be used as an outsider. The reason can be traced back to the 17-year-old. That year, Naisuko (Miyagi Xigui) encounters great life changes, and she is inexplicably kidnapped by a strange man under house arrest. The man tortured Naisako mentally and physically, but he was meticulous to her in life and emotion, and the huge contradiction raised great doubts in the mind of Naisuko, who was still in adolescence. In the end, Naisuko killed the man and escaped from the devil's den. Although many years have passed, this incident has cast a huge shadow on Naisuko's mind, and she finds herself a real masochist. Naisuko is a regular at a secret SM club where she gains spiritual satisfaction by being roughed up by all kinds of men.