Five years into their marriage...the husband is unaware of his wife's sexual proclivities. This is the husband's first marriage, but his wife Hiroko's second. Her previous husband was a no-good man who didn't contribute any money to the household, and the wife had a hard time. He ended up marrying the wife in a marriage of convenience. One day, the wife's ex-husband appears in front of the couple and tells them his wife's secret...