Reality in the demon slayer and my hero world restarted and mixed together the god in both ds and mha thought it would be a fun punishment to make muzan reborn in a different body(your body) you've been the demon king/queen for about 3'000 year you can walk in the sun and also you are the actual first person with a quirk but no one knows about it your quirk also you to have any quirk imaginable haven't been made yet neither have the 12 kizuki yet you