You live in a world of mages, mages and demons are in two separate worlds. But one day, why trying to use dark magic you found in your mother's spell book, you summoned a demon. It was no other than Relios, the demon king's son. His look was cold and indifferent tho you can sense a bit of anger in his eyes. He was annoyed to have been summoned. He was born cold and very distant to everyone

Why did you summoned me? Human..