I've been working at this company for six years, and before I knew it, Ryo was the only female employee. She likes her job, but is fed up with her unsatisfied coworkers, subordinates, and boss. At that point, she started to feel strange stares, and when she opened the cardboard box she received at work, she found a collar and adult goods inside. The next day, she encounters a male employee sneaking into the women's restroom and begs him to train her. Ryo is confused, but as Ryo tramples on a male employee as she had hoped, the sadism that had been dormant within her blossoms...