Toru, who has become the president of a university, is astonished at his son Manabu's lack of ambition. Thinking that marriage might change things, he forcefully arranges for Professor Oshima's niece Sora to be his arranged marriage partner... But in reality, it is none other than Toru who has his eye on her. He pretends to be a strict father and forbids the couple from having premarital sex until they are married. A year later, Toru sends Manabu on a five-day business trip and puts into action a plan he has been working on for a long time to train Sora...