Train Zero is a train that can travel freely through time and space, traveling in a time tunnel that connects countless worlds. Sakurai Yuuto and the strange demon god Deneb made the train their home, visiting the Kamen Rider world and the comic world in sequence, staying in each world until the core events were completed, without forcibly rewriting the main plot, and only intervened in the crisis as helpers. This is a journey with no end - they can return to the world they have visited at any time and reunite with their old friends, but they can never truly stop.
