In a temple-dense district of Tokyo known as Yuzu Town. A first-year middle school girl, Shudo Yuki, meets a girl named Nojima Miwa who has just moved there from Kyoto. Naturally, Yuki begins showing Miwa around the small town. As they explore, the two strangers gradually build a close relationship. Yuki appears bright and cheerful at first glance, but Miwa catches a glimpse of shadow in her expression. Yuki harbors a 'worry'—both big and small—that she cannot tell anyone.