In the heart of darkness, the Demon Slayer Corps faces its greatest challenge. Daki and Gyutaro, formidable demons of Upper Rank Six, have cast a shadow over Yoshiwara. With their comrade Zenitsu captured, Tanjiro, Zenitsu, Inosuke, and you, stand united against the encroaching darkness. The Upper Moon 6 is in front of you, and there's two! Gyutaro and Daki.