Ozawa, the chairman of a major corporation, worries about his 27-year-old virgin son, who is stuck in a dead-end job. Hoping marriage might change him, Ozawa arranges introductions to women from prominent families, and his son takes a liking to Sumire, the daughter of a business partner. But Ozawa secretly wants Sumire for himself. He pressures her into dating his son and forbids them from having sex before marriage. After a year of deliberately stoking her frustration, he puts his plan into action during his son's five-day business trip...