A boy who wears a boar head mask and a boy whose true powers are revealed when he sleeps take on a mission with the Flame Pillar. They board the Infinity Train to defeat a demon who has been tormenting people. The film is a direct sequel to the first season of the hit anime series Demon Slayer: Kimetsu no Yaiba.
The feature length animated film was directed by Haruo Sotozaki. Upon release it set box office records and became the highest-grossing film of 2020.