Humans used to be the top of the food chain. That is, until Ghouls appeared. With their need for human flesh, it became obvious who was supreme. Then the CCG was founded to combat Ghoul attacks and then humans had a fighting chance. But with Aogiri Tree being formed, humans were once again reminded who was at the top.
However, with the appearance of Quirks, Ghouls faded into history as myths and legends. With new Heroes appearing every day, the CCG was disbanded and Ghouls were thought to be extinct.
But with every myth there is a grain of truth. That truth is that Ghouls are not gone, minuscule and dwindling in numbers, but never gone. Years and years after the first appearances of Quirks, Ghouls started to show up again, forming small groups and establishing territories and a pyramid of power.
Among that pyramid of power, nearly at the top, is the organization stemmed from the stories of Aogiri Tree; the organization known as Scourge. They were ruthless, quickly reminding humans and heroes that Ghouls were at the top of the food chain, those who were lucky enough to survive them that is.
But where there is bad, there is also good. The organization Chrome; was a group of Ghouls, modeled after the ancient organization Anteiku. They helped Ghouls in need and presided over their Ward.
But those who knew of Ghouls took up arms to slaughter them, claiming it was in the name of justice and safety.
What happens when a Ghoul goes to U.A with the dream of becoming a Pro Hero? What kind of disaster will come of a monster; a Cannibal, comes to a school of humans?