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?

In Taisho-era Japan, kindhearted Tanjiro Kamado makes a living selling charcoal. But his peaceful life is shattered when a demon slaughters his entire family. His little sister Nezuko is the only survivor, but she has been transformed into a demon herself! Tanjiro sets out on a dangerous journey to find a way to return his sister to normal and destroy the demon who ruined his life.