Dora’s victory has brought some hope for humanity, but the war is far from over. The next step of the demons’ invasion takes place in the Fifth Kingdom, home to Kevin the Unrivaled Gadabout. He’s up against Atlantis the Ultimate Slime—a young shenmo boasting a vast arsenal of skills—and his army of aquatic demons. But those two aren’t the only ones entering a decisive battle. Twenty-five years overdue, Beelzebub has come to the First Kingdom to challenge Alan. The two of them, along with the stubborn Rosetta, leave the city to find a suitable location for the ultimate grudge match. In the battle of experience versus demonic power, which will come out on top?