Keisuke, an obstetrician-gynecologist, has lived with his son and daughter-in-law and run a sex clinic since his wife passed away. His daughter-in-law, Keiko, is a rarity these days: she was a virgin until her wedding night. Her husband, Yuji, suggests she consult Keisuke, as she has yet to experience real sexual intercourse. The following evening, Keiko calls Yuji, who has traveled away for a medical conference; however, he is in the middle of an affair with an office worker he met online. A few days later, Keiko decides to undergo an examination by Keisuke.