Perfect Hell -[Ereri]

In a perfect world, a utopia built in walls, where everything is suppose to be 'perfect'....also called 'hell' in the mortal world. Levi Heichou, a normal kid, going to school and doing everything as expected from his parents, but when the secret breaks out. Things turn to hell. Society breaks. Then A demon appears, Levi knows nothing about what's happening, who or what that is. He knows for sure though, that after getting to know this 'demon' his life is more, how should we put this, in dangerous. He has fun with him, but how does he like the risks that come from having this fun and some romance?