Along with the appearance of Chaos Monsters formed by Chaos Cores, which is said to be created by demons to conquer the human world, a power was created to help the humans kill the Chaos Monsters invading them. This power was called Crest, it is said to strengthen the power of its wielder. By consuming other Crests, the said person to consume their Crest will get the power of their Crest to add it to their own. People who got the power called "Crests" were called Conquest Knights as they were meant to dominate the continent and vanquish the demons. Watch as Ren, a common commoner of the kingdom of Blackheart, rise to the position of Emperor and get wives along the way!