University student Mitsu has an unexpected reunion with her ex-boyfriend from middle school, Kaede, at her new apartment building. Because of their past in which hurtful things were said to one another, Kaede was the last person on earth Mitsu ever wanted to see again. However thanks to this reunion, they both learn that their breakup was because of a huge misunderstanding. Is it possible to restart a relationship anew and find a happy ending?