After discovering her husband's infertility and their inability to have children, Asahi's marriage gradually turns cold. Overwhelmed by stress and on the verge of mental and physical breakdown, Asahi begins working part-time at a restaurant to clear her mind. One day, she is seduced by the restaurant owner and starts a physical relationship with him. From then on, Asahi's libido surges uncontrollably, and even her sense of shame transforms into pleasure. A master-servant dynamic develops between them, and she falls completely into the role of a submissive sex slave.