It's not a Quirk?

After the defeat of Muzan and his demons, peace finally came to Japan. But many years later were quirks are born, a new demon king has been born and joins forces with the number one villain, All For One. But what they do not know is that two heroes will rise again to stop them. This is the story of how Izuku Midoriya(Deku) and Tanjiro Kamado became heroes that saved the world.