The 2020 anime film debuted during the autumn season in Japan and immediately broke records in its homeland.
As Variety reported, by December of last year, "Demon Slayer: Mugen Train" had become the biggest box-office hit for the country. In fact, it beat out the previous record-holder which was Hayao Miyazaki's 2001 animated movie "Spirited Away." Via Indie Wire, the film made around $350 million at the Japanese box office.
Following the events of "Demon Slayer Kimetsu no Yaiba" Season 1, "Demon Slayer: Mugen Train" follows siblings Tanjiro Kamado and Nezuko Kamado with fellow demon slayers Zenitsu Agatsuma, Inosuke Hashibira, and Kyojuro Rengoku.