A group of homicidal maniacs, gangsters, terrorist, and some eccentric thieves all board the same train. Some want to rob it, while others just want to create chaos. On top of all this some of these people seem to be immortal, and a mysterious being called "Rail Tracer" is terrorizing the train. What are the mysterious origins of all these events, and who will be able to survive the train’s madness? Based on a series of light novels.