After the traumatic events on the Mugen Train, the Demon Slayer Corps grapple with the aftermath. But with a new threat emerging in the form of a demon preying on the women of the Yoshiwara Entertainment District, the Sound Hashira, Tengen Uzui, and his trio of wives take action. When his wives go missing during the investigation, Tengen seeks the aid of Tanjirou Kamado, Zenitsu Agatsuma, and Inosuke Hashibira to venture into the district's elite establishments and track down the sinister Upper Rank Demon lurking within.