The king of demons rules with all the demons, and, using his vast strength, he put the human race after 1000 years of oppression. Thus, the human era is over, and the Epoch of the Demon began. Lucifer inherited the title of the king of demons inherited from his father. However, instead of dealing with people, he prefers to get along with them. Moreover, he is sick at the sight of blood. Since all people knew where the castle of the king of demons was located, he was constantly trying to kill the killers. Therefore, he decided to leave Casta and live in the desert, where people could not find him ... or so he thought. Since all people with power were defeated by them, people sent a girl to defeat him. How can Lucifer cope with this beauty sent to destroy it?