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Twenty years ago, Lucifer was given the job of a brave man and traveled to the fantasy world of the West. He originally thought that he could flex his muscles, spread his power, and save the world handsomely. As a result, when he opened his eyes, he was actually the son of the Demon King, one of the most evil demons. For twenty years, his bravery level failed to rise by one level. Twenty years ago, Airei led a team of brave men to break through the Demon King's Castle and kill the Demon King. She thought she could return home in fine clothes and live a peaceful life. As a result, she was assassinated in the Demon King's City, fell into the bottomless abyss, and fell into a long sleep. It took her twenty years to wake up from her sleep, still carrying the curse of becoming a demon. In order to become a brave man, Lucifer must fight his way into the Demon King's Castle and kill the new Demon King. In order not to become a demon, Airei must enter the Demon King's Castle and lift the demon's curse. So the demons, who are brave men, and the brave men, who are demons, embarked on the road back to the Demon King's Castle.