As Misaki prepares for her upcoming wedding, she stumbles upon her late father's broken pocket watch, discovering its sentimental link to her grandfather and their shared history at Tokyo Station. Reflecting on her strained relationship with her father, Misaki sets out to revive the watch at the now-vanished repair shop, only to encounter a station employee bearing a striking resemblance to her father, prompting her to impulsively pursue this mysterious doppelganger.