Flame Hashira Kyojuro Rengoku receives new orders: Travel to the Mugen Train, where over forty people have gone missing, and conduct an investigation.
Leaving the Demon Slayer Corps Headquarters, he sets off on this new mission.
Last night, we thought
you'd fled because we showed up,
Creí que anoche huiste al detectarnos,
Creía que anoche huiste al detectarnos,
Na noite passada nós achamos que você 
tinha fugido porque nós tínhamos chegado,