Miyuki Matsushita, her beloved husband, and his younger brother lived together as a family. Their life seemed peaceful on the surface—until Miyuki fell into the younger brother’s cunning trap. He discovered her secretly using adult toys for masturbation and obtained evidence, using it to blackmail her. From then on, every time her husband left for work, Miyuki was forced to be alone with her brother-in-law, compelled to serve as his personal plaything. Day after day, the humiliation and domination deepen, driving her further into despair.