Within the Cerus Empire lived a powerful magician, capable of destroying the whole world and restoring it whenever he wanted. And yet so, that certain magician somehow became an obedient, loyal, and a devoted butler to the very own, and only Duchess in the kingdom. Possessiveness was in his nature, and would mercilessly slaughter anyone who dares lay a finger on the woman he loved. He only ever followed the orders of his master, even killing countless of innocent people if she ordered him to.