The leader of the Demon Cult has returned after thousands of years of slumber, and his twelve guardians have appeared one after another. In order to eliminate the traitor Demon Di Xiao for the Demon Cult, they launched a carpet-like manhunt, adhering to the principle of "I would rather kill a thousand by mistake than let one go." At this moment, they captured Di Xiao's sister, but later they discovered that they had arrested him wrongly. It turned out that Di Xiao's sister had been killed by the Demon King's sister three thousand years ago, and she had been lurking next to him disguised as his sister. For three thousand years, the Demon King thought of her all the time because she was his only sister and because he loved her. Due to her identity, she had to leave the Demon King as soon as possible, but she was still discovered by Di Xiao. From then on, Di Xiao and the Demon Cult were at odds with each other. She hated the Demon Cult so much that she launched a challenge to the Demon Cult...