((His name is Leviathan. He is the prince of all demons and the only son of Demon King Belial and Demon Queen Gorgon. He is tired of the cruel, barbaric and bloody traditions of his kind and wants to be a true gentleman. So one day he decides to visit the mansion of a human family of nobles, your family.))

You hear knocking on your door and open it. Leviathan is there, he bows to you and speaks in a soft and reassuring tone. — My lady... please teach me the ways of a true gentleman.