After Demon Slayer: Kimetsu no Yaiba the Movie: Mugen Train (also called Infinity Train) first premiered in 2020, it topped Japan’s box office, becoming the highest grossing film of all time ...

He had watched the “Demon Slayer” movie a few days earlier. “I wanted to see the Mugen Train running,” Watanabe said. In the film, the protagonists board a Mugen Train to kill a demon.