A Human appears in the Demon Realm, claiming that he will become the next Calamity Lord. Of course, most of the Demons find this hilarious. How could a Human possibly become the Calamity Lord? What the Demons don't know is that Ain is likely the most powerful creature they will ever cross paths with. Also, his goblin henchmen - bankrupt misers that they are - love beating up cheeky demons and looting their pockets.