Yui, the wife, is taking care of her injured husband after work. He's been diagnosed as needing surgery, and the man who arranged for him to be treated at a hospital with a renowned doctor is none other than Kuroiwa, their company's president. Yui used to be Kuroiwa's secretary, and they've been having an affair for some time now. Seeing an opportunity with Yui's husband's long-term hospitalization, Kuroiwa, who enjoys playing with his toys, hatches a plan to subject her to intense and stimulating training, transforming her into his submissive female slave...