Kinji Ninomiya, a self-made NEET who gamed the Tokyo property market into a private skyscraper suite, is barely settled into his idle life when a hole in the floor drops him into the fantasy world of Amuria. Conscripted into Raiza'ha Mining, a corrupt dungeon-extraction firm, he is buried under back-dated debts and forced to swing a pickaxe alongside the gentle lizardman Wanibe. Kinji starts plotting his way up the corporate ladder with the help of Rim, a captive demon with an enormous appetite, scheming, swindling and union-busting his way back toward an easy life.