Paranormal investigators Ed and Lorraine Warren take on one last terrifying case involving mysterious entities they must confront.

Will Radford is a top analyst for Homeland Security who tracks potential threats through a mass surveillance program, until one day an attack by an unknown entity leads him to question whether the government is hiding something from him... and from the rest of the world.

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.