Demon Slayer: Infinity Castle Arc - Chapter 1: Akaza Strikes Again

To turn his demon sister Nezuko back into a human, Tanjiro Kamado joins the Demon Slayer Corps, battling various demons alongside his comrades Zenitsu Agatsuma and Inosuke Hashibira, their friendship and bonds deepening as they grow. Later, Tanjiro fights alongside the Hashira, the highest-ranking swordsmen of the Corps, on multiple occasions. As they prepare for the impending final battle, Tanjiro and his fellow slayers are undergoing joint intensive training led by the Hashira when Muzan Kibutsuji suddenly appears at the Ubuyashiki estate. Rushing to save their master from danger, Tanjiro and the Hashira are cast into a mysterious space by Muzan. They fall into the Infinity Castle, the demons' stronghold, marking the beginning of the final showdown between the Demon Slayer Corps and the demons.