According to popular belief, train stations serve not only as endpoints and beginnings for many individuals, but also as locations for lost and forgotten items-and people who are overlooked. On a gloomy day, Minky Momo takes the train in search of her final destination and encounters an elderly gentleman seeking to reunite with someone crucial to him. Upon learning that he had misplaced his passport on the train, Momo decides to assist him in locating it. In doing so, she stumbles upon both her doppelganger and a young girl who requires their aid. The latter is connected to the station and yearns for resolution to her difficulties.