In this time there are people that are better known as celestials, they were born to fight off demons and send them to their dimension. They were destined to protect the human race from these "dangerous" demons, but some of these demons (Katsuki Bakugou) can disguise themselves as normal humans. If they are caught they are evaluated to be proved if they are truly dangerous or not, if not they are given certain rules and are allowed to live among these humans, if they are they are sent to the demon world. What happens when Izuku Midoriya sees Katsuki Bakugou switch out of his demon form?