Tanjiro Kamado, joined with Inosuke Hashibira, a boy raised by boars who wears a boar's head, and Zenitsu Agatsuma, a scared boy who reveals his true power when he sleeps, boards the Infinity Train on a new mission with the Fire Hashira, Kyojuro Rengoku, to defeat a demon who has been tormenting the people and killing the demon slayers who oppose it!

Tanjiro Kamado, joined with Inosuke Hashibira, a boy raised by boars who wears a boar's head, and Zenitsu Agatsuma, a scared boy who reveals his true power when he sleeps, boards the Infinity Train on a new mission with the Fire Hashira, Kyojuro Rengoku, to defeat a demon who has been tormenting the people and killing the demon slayers who oppose it!

The battle rages on as Shirou continues to protect Sakura, now consumed by the darkness. He joins forces with Rin to end the Holy Grail War, while Illyasviel, who knows the truth behind it, confronts her fate. Amidst the chaos, Zouken plots to manipulate Sakura for his own desires. The final fight begins.

Ten years after the Fourth Holy Grail War, a devastating clash between Masters and Servants, another war erupts. Shirou Emiya, whose father fought in the first battle, was leading a peaceful life with the warmhearted Sakura Matou. But when hidden forces begin to stir, Shirou resolves to fulfill his father’s dying wish, protect Sakura, and fight for the Holy Grail.

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.