Demon Slayer Manga Vol 9 by Koyoharu Gotouge

Tanjiro and his friends accompany the Hashira Tengen Uzui to an entertainment district where Tengen’s female ninja agents were gathering information on a demon before they suddenly disappeared. In order to investigate, Tanjiro and the others disguise themselves as women to sneak in! As they close in on their target, the demon reaches out for the courtesans of the district!