The Demon Slayers fight hard to get their blades closer to Muzan's neck! To avenge her family, Kanao must continue to battle Doma head-on, while Iguro and Kanroji find themselves slashing through the shifting rooms of Infinity Castle. Elsewhere, Tokito, Sanemi and Genya come face-to-face with a villain who recognizes Tokito, but Tokito doesn't know him. Who is this powerful adversary?