Des:Ozawa, the chairman of a company, is worried that his free-spirited son has no intention of getting married, so he plans an arranged match between his son and Rio, the daughter of a business partner. However, this arranged marriage is not for his sons sake but for his own desires... Ozawa forcibly allowed her to date his son and forbade any premarital sex until the wedding day a year later. One year later, Ozawa orders his son, whose first night ended in failure, to go on a business trip for five days, and Ozawa, who is alone with Rio, starts the training plan he has been waiting for since then.