The Demon Slayer Corps faces a perplexing case of vanishing individuals aboard a notorious train. To combat the suspected demon at play, Kyoujurou Rengoku, known as the Flame Hashira, must first confront a menacing demon hindering their journey. With Tanjirou Kamado, Inosuke Hashira, and Zenitsu Agatsuma joining forces, they brace for a showdown aboard the Mugen Train. Little do they know, the demon harbors a sinister agenda to unleash chaos by manipulating the minds of all onboard, showcasing the formidable might of the Twelve Kizuki.