Oshima, a managing director at a large company, is worried about his son who has no desire to work. Thinking that he would change his mind if he had a girlfriend, he arranged an arranged marriage with Yu, the daughter of a subcontracting company manager. However, Oshima took advantage of this situation and decided to keep Yuu, his favorite, by his side and make him his own. In order to prevent his son from touching Yuu, he forbade her to have premarital sex for a year until her marriage. Then, the following year, I sent my son on a business trip for five days, and Yuu, who was unable to handle his sensitive body due to his abstinent days, began a life of training alone...