A few years into their marriage, Aoi and her husband Shinichi are living happily, though they have no children. One day, Mamoru, Aoi's brother-in-law, who has just found employment, comes to visit. "My boss invited me to play golf, but I've never played golf before..." A golf game with his boss could affect his future as a working professional. Shinichi, unable to bear seeing Mamoru like that, asks Aoi to be his "coach," but... The next day, Aoi begins teaching Mamoru golf. However, he gets too excited about the coaching and the two of them become closer...