the president of a famous company, Tanabu, was at his wits' end with his virgin son who was approaching 30. hoping that marriage might change him, tanabu used his power to arrange a meeting between his son and nao, the daughter of a subcontractor company's manager. however, tanabu's true intention was to make nao his own. the engagement proceeded rapidly, and tanabu, acting as a strict father, forbade premarital relations. on the day he sent his son on a five-day business trip, tanabu put his plan to train nao into action.