The story follows Hiroto Kamado, a young boy who becomes a demon slayer following the slaughter of his entire family by the lord of demons, except for his little sister and brother Tanjiro and Nezuko. Nezuko, however, was turned into a demon herself. Hiroto, alongside his younger brother Tanjiro, vows to find a cure to save and turn Nezuko back into a Human and find whoever was responsible for the death of his family.