Meanwhile in Taisho era Japan that is suffering right now and not well lemme explain the Demon king Muzan Kibutsuji and the 12 kizuki have been causing harm to Japans citizens and some people even wanted to become demons and the demon slayer corps are the protecters of human kind and humanity thanks to the 2 brothers who have established the demon slayer corps Michikatsue and Yorichii the strongest slayers are the 9 hashira who work with some demon slayers on missions to stop demons attacking