After losing his family and watching his younger sister become a demon, Tanjiro Kamado joins the Demon Slayer Corps to avenge them. The leader of the Twelve Kizuki captures Lady Tamayo after Ubuyashiki's attempt to stop him fails, plunging Tanjiro, Zenitsu, Inosuke, and the Hashira into the demons' stronghold, the Infinity Castle. Now, they must face off against some of their most powerful foes.