Hiro Matsuoka On The Runaway Success Of ‘Demon Slayer: Mugen Train’ And Toho’s Future In Anime Since the release of the anime movie 'Demon Slayer: Mugen Train' in Japanese theaters, it has gone on to become a real box-office phenomenon and broken several records in the process. To find out more I spoke with Hiro Matsuoka from Toho to understand the movie’s appeal.