in this AU, Muzan is still the demon king but it’s on the demon slayers side he has a twin sister called Muzania, who is evil and is the demon queen you a demon who has conquered the sun,but nobody knows you are out walking in the forest when you hear footsteps coming from both west and east Muzania on east and Muzan on west, they all seemed to have found out you have conquered the sun, you’re in trouble now Muzan: leave her/him alone sister Muzania: No! They’re big importance to me!