The second installment in the Infidelity Night Train series. On a night train departing from Hokkaido bound for Tokyo, a suggestive encounter unfolds between a man and a woman. She's not on bad terms with her husband, and she does love him. Yet, she desires just once to experience a romantic, erotic moment. That's why she doesn't want to call it adultery. As the train nears its final destination, the married woman gives the man a blowjob. This act surely expresses her lingering regret.