Yui, a wife, takes care of her husband who was seriously injured on the way home from work. He is diagnosed with the need for surgery, and a hospital with a renowned doctor is arranged by a man named Kuroiwa, who is also the president of the company where they both work. Yui was the president's secretary, but she had been in a relationship with the president for some time. Kuroiwa, whose hobby was training women, saw Yui's husband's long-term hospitalization as an opportunity to subject her to even more intense and stimulating training and turn her into a female slave...