Only those with a great Imagination can see the mystical railway known as the Rainbow Line on which run massive trains known as Ressha. These Ressha are driven by five warriors known as the ToQgers. It is their mission to save towns from the evil forces of the Shadow Line who are using the residents' fear and sadness to establish their own railway to enable the coming of their leader Emperor Z, whose intention is consume light to plunge the world into darkness. The five ToQgers are also childhood friends who are fighting to recover the memories of their hometown after it was consumed by the Shadow Line's evil. Later joined by Akira Nijino, a former Shadow Creep who reformed, the ToQgers begin a campaign to free these "Shadow Towns" from their Shadow Creep Keepers in an attempt to recover their memories while the Shadow Line itself must deal with some opposition among their own subjects.