Tanjiro, Zenitsu, and Inosuke go on a mission to the Yoshiwara pleasure district with Tengen Uzui, the Sound Hashira. Indeed, it is there that Tengen's three kunoichi, sent for reconnaissance to track a demon, have disappeared. To investigate in the courtesan houses, Tanjiro and his companions must disguise themselves as girls. But despite all their efforts, the demon seems nowhere to be found. Will our heroes manage to track him down before he devours the courtesans?!