A world-class professional gamer is murdered over a prize money but is immediately given a job as a beta tester by a suspicious afterlife company. His job is to explore and find flaws within the New World, project name 'Dungeon,' which is set to launch after the scheduled Apocalypse in the next two millennia. In return for his service, he may acquire a share of the New World and become a deity of his own, if all things go well, that is. But this is no game, and the protagonist has to do his best just to stay alive in an unbalanced, perilous environment of the Dungeon filled with hostile monsters and antagonistic individuals. He starts out with nothing but a bow and a dozen arrows, and his only silver-lining is that he has a special ability to steal an enemy's skills upon critical hits. Freshly code-named Beta, the protagonist sets out his adventure in the Dungeon.