Shortly after marriage, wife Nachi's sex life with her husband came to an abrupt halt. Burdened by work stress and worsening communication, the distance between her and her husband continued to grow. At a drinking party, she met a man who captured her heart, and they began a romantic relationship. However, their bond exists in a delicate space—more than just lovers, yet less than husband and wife. He is called "slave," becoming Nachi's sole source of hope. How will their relationship evolve? The story of Nachi, whose marriage crumbles as she awakens to a new love, begins here.