Long ago, a green hair boy name Izuku Midoriya lost his mother from a demon attack at a young age, and now he was adopted by the Kamado family. But one day when Tanjiro and Nezuko want out to sell some charcoal, the Kamado family and Izuku were attack by Muzan Kibutsuji and turn Izuku into a demon. So what happens now? well you have to read and find out. I do not own Konei Horikoshi's My Hero Academia and Koyoharu Gotouge's Demon slayer