The Demon Slayer Corps has been unable to solve the enigmatic disappearances plaguing a train, prompting Flame Pillar Kyoujurou Rengoku to take matters into his own hands. The skilled novices Tanjirou Kamado, Zenitsu Agatsuma, and Inosuke Hashibira join Rengoku in his quest to stop the threat and save lives on board. Unfortunately, they are unaware of the malevolent demon orchestrating the chaos, already putting their plan into motion. As the team fights to protect the 200 passengers, they must overcome their fears and wield their weapons against the evil presence. Kimetsu no Yaiba Movie: Mugen Ressha-hen delves into the psyche of Tanjirou, testing his commitment to his duties to the limit.