Reiko and her husband Tomohiro attend their high school reunion for the first time in a long time. There, they reunite with Ryoichi, who was a good friend at the time. The three of them always hung out together, and were supposed to move to Tokyo together after graduation... But that promise was in vain, and Ryoichi remained alone in his hometown. They talked about old memories, and the next day they decided to go to their old school to dig up a time capsule...