An office worker transmigrates into a life on hard-mode: under a mountain of debt! His new body's owner, Charrion Zacarias, sold his soul to the Dark God to wish it all away, only to wind up in a crushing contract. Since Charrion is gone, this new soul now owes the Dark God 999 wishes, on pain of annihilation! But with modern business savvy, hustle, and an eye for negotiation, this salaryman will become the best servant the Dark God has ever seen!