Demon tanjiro

After muzans weird outershell melted away muzan somehow became imortal to sun so he decided to give all of his blood and powers and strength to the main character in demon slayer thats is Tanjiro kamado his sister nezuko also turned into a demon but when this happened she was human again and they both were demons nezuko was his main kizuki helper all of the main demons were now under him with tanjiro being a demon for a short time Kanou injected him with a cure and he became back to his normal human self.