Demon Slayer: Kimetsu no Yaiba Tanjiro Kamado, Unwavering Resolve Arc

In a world filled with man-eating demons, the entire family of the protagonist, Kamado Tanjiro, was killed by them. His younger sister was turned into a demon as well. Under the guidance of a demon hunter, Tanjiro became part of the demon-slaying group known as Demon Slayer Corps. In order to turn his younger sister, Nezuko, into a human again and defeat the demon responsible for his family's death, Tanjiro wages war against the horde of demons...