The world is in chaos The demon destroy everything on their path The demon only one purpose is that to find a green hair boy back to the princess because she has fallen in love with him because an unexpected meeting The remain kingdom join forces to stop the demon and they build an empire and they name it empire riverland The demon princess will do anything to find him even kill anyone that try to hide him from her The imperial Knight were teach how to use magic to defeat the demon *they were in their 20 in this story*