After the fight on Mt.Natagumo, Tanjiro Kamado and his sister Nezuko, who is a demon, are captured by the Demon Slayer Hashira, the top warriors of the Demon Slayer Corps. Tanjiro is put on trial for breaking the rules of the corps by traveling with a demon and fighting alongside her. To demonstrate his innocence, he must prove that Nezuko is not a threat to humans and that he is determined to turn her human again.