Akiyama Morikazu is the owner of a watch shop at a local shopping street. One day, a young lady called Miyahara Ryo visits Akiyama with an old wristwatch that she wants to repair. Akiyama somehow finds the watch familiar, and is shocked to learn that Ryo's mother is Kuniki Chikako, his former girlfriend. The two of them struck up a friendship through a company trip 25 years ago and grew attracted to each other. The watch in Ryo's possession was Akiyama's present to Chikako at that time...