Tanjiro Kamado lives peacefully with his family in the mountains until the day they are massacred by a demon. His sister Nezuko is the only survivor, but she has been transformed into a demon herself. Refusing to abandon her, Tanjiro joins the Demon Slayer Corps in order to find a way to restore her humanity and fight the creatures responsible for these massacres. Through his training and missions, he faces increasingly dangerous demons while discovering the rules, warriors, and secrets of this hidden war.