In a town hidden beneath the earth's surface, where mountains resemble towering trees and the air is so toxic and dark that its release would bring unspeakable horrors, stands a lonely yet defiant place known as Blackthorn Academy. This institution is designed exclusively for the abnormal and nothing less. Crows surround the academy as if it were their home, watching over the school beneath a beautiful, blood-red moon that rises majestically behind it. However, none of this could prepare the students of Class XI for the pandemonium that awaits them.