The film picks up from a thrilling cliffhanger of the fourth season, where Tanjiro and his fellow comrades are thrust into the lair of the demon-in-chief, the cunning and all-powerful Muzan Kibutsuji. Much of the film is structured around various battles between the series regulars and their sworn enemies. The challenge of sustaining the narrative is tempered by the use of flashbacks, providing a backstory for each of the formidable foes.