The Demon Slayer Corps are drawn into the Infinity Castle, where Tanjiro, Nezuko, and the Hashira face terrifying Upper Rank demons in a desperate fight as the final battle against Muzan Kibutsuji begins.

Hiranyakashyap, the tyrannical demon, challenges Vishnu, proclaiming himself a god. However, his son Prahlad remains devoted to Vishnu, who appears as Narsimha to defeat the demon.