Charrion, an office worker, transmigrates into a magical world and wakes up buried under billions in debt. To make matters worse, a failed summoning ritual binds his soul to the Dark God, forcing him to complete 999 grueling tasks or face total annihilation. Armed with workplace hustle, strategic scheming, and brutal training, Charrion must fight to clear his debt and survive his deity boss. The Dark God's new servant is using office survival skills to dominate a fantasy world.