In a chaotic world dominated by seventy-two Demon Kings, he was reborn as the seventy-second Demon King--Astaroth. A goddess suddenly appeared before him in his confusion, instructing him to become the Supreme Demon King and reform the world. After taking down the Demon Kings Sabnac and Eligos with the help of Eve, Hijikata Toshizou, and Jeanne d'Arc, Astaroth has set his sights on the star-shaped Demon King Decarabia. But even though Astaroth has cleverly used economics to back Decarabia into a corner, could the rival Demon King have a trick up his own sleeve?