Light Novel Other Size He becomes the King of Monsters, the Betrayed Thieves and the Demon King and takes control of the world. Ichijinsha Novells

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It was a cloak of curse that Thief Keith, one of the subjugate the Demon King, obtained as the spoils of the subjugation of the Demon King was a cloak of curse. He was betrayed by the king and other brave men and almost killed, but escaped for his life. After that, when he woke up, he had a big horn on his head and had changed his job to the highest position called "Kaito-Maou"? After that, Thief Keith, who became the Demon King, accompanied by Shitenno who was a subordinate of the former Demon King, took away the skills and status of his former colleagues? And when the Demon King and his party who had accomplished their revenge spend their time leisurely, the world's greatest disaster comes?