As the underworlds school bells ring, a little sheep wakes up at the Royal Academy of Diavolo in the Devildom - where seven eccentric demon brothers await. This wooly critter is actually a human exchange student so how did they end up a sheep? Everything is a blank! Now, this sheep must figure out how to turn back into a human and regain their memories as Lucifer and the other demons raise hell with devilish hijinks!