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