Ozawa, the chairman of a company, is worried that his free-spirited son shows no signs of marriage, so he arranges an arranged marriage meeting between his son and Rio, the daughter of a client. However, this arranged marriage is not for his son's sake, but for his own desires... Ozawa forces her to approve the relationship and forbids any pre-marital sex until the wedding day one year later. Then, one year later, after the failure of their wedding night, Ozawa orders his son to go on a five-day business trip, and finally gets to be alone with Rio, and begins his long-awaited training plan...