Train45 begins with an ordinary commute derailed by a sudden journey into another world. The player awakens on a train with no driver or other passengers, alongside two strangers, and is asked by its self-proclaimed master, Konial, to investigate the distortions appearing throughout its cars. Exploration and mystery set the stage, while the train’s unsettling reality and the companions’ buried feelings develop together.
Its chapter-based investigations revolve around moving between train cars to examine strange anomalies. These phenomena advance the story and affect the emotions and bonds of the companions, so exploration has a narrative purpose beyond finding the next clue. Choices and interactions also deepen relationships, opening character events and branching endings. An equipment system adds a progression layer: collected items and affinity can be exchanged for gear that improves perception and investigation speed, with later chapters unlocking features for reaching hidden routes.
The result is a single-player experience built around story, investigation, and relationship choices rather than shared-session play. Its listed features include five female characters to pursue, more than forty CG H-scenes, and full Japanese voice acting.