Tabuchi, the chairman of a major company, is troubled by his virgin son, who is nearly 30. Hoping marriage might change him, he uses his power to push Nao, the daughter of a subcontractor's manager, into an arranged meeting with his son. But Tabuchi's true goal is to claim Nao for himself. He rushes the marriage forward, poses as a strict father, and forbids premarital sex. The day he sends his son away on a five-day business trip, he finally puts his plan to train Nao into action...