Train stations are known to be more than just an arrival or departure point for many individuals. Often, they serve as a temporary home for lost items and forgotten souls. On a dreary day, Minky Momo hops on a train headed towards her ultimate destination. During her journey, she strikes up a conversation with an elderly gentleman who is on a mission to reunite with someone of utmost importance. After realizing that he left his passport on board, Momo sets out to locate him. This leads her to meet her doppelganger and a young girl who requires both their assistance. The girl has a connection to the station and yearns for a solution to her problems...