With Kyojuro Rengoku now a demon, Tanjiro must now help to prove Rengoku and Nezuko can still fight as Demon Slayers. But when Rengoku discovers his demon powers, Tanjiro is conflicted on whether he made a mistake and is wondering if this is all part of Muzan Kibutsuji's plan on defeating the Demon Slayer Corp.

Rengia Rengoku, daughter of Senjuro Rengoku and niece to the Flame Hashira, Kyojuro Rengoku, sets out to become the next Flame Pillar and to follow her uncle's footsteps. Along the way, she meets three friends, reveals a shocking secret, and encounters a familiar demon.

Witness an ancient tale of Morax as he tells a story of how the Seven came to be, his one true love, a best friend, a spirited young sister, and the most brutal war Teyvat has ever seen in history.