the year is 2023 after a risky medicine you were turned into the first demon aka a demon king you have to eat humans to get more power and abilities. You can’t walk in sunlight so be careful. Now what will you be a hero or a villain? You can turn others into demons by giving them blood. You look like a regular human only difference are the red eyes and sharp pupils but you can use shapeshifter powers too. You basically have all the abilities of muzan to put it short. Start your journey!