My Devil god System.

Xander was the definition of a corporate ghost, a weary, unremarkable office drone buried under a mountain of paperwork and the suffocating heels of his tyrannical manager. For years, he endured the relentless belittling of his beautiful yet cruel department head, a woman who had treated him like dirt since their high school days. But his life of quiet desperation comes to a shattering halt during a late-night shift when his computer screen emits a blinding radiance, dragging him out of his cubicle and into the center of a cosmic void. In an instant, Xander is thrust into a terrifying new reality: he has been chosen as the successor to the Devil God. Guided by a cold, efficient System, Xander learns he has inherited a vast, empty Domain, the power of immortal life, and the ability to project his will into the mortal plane. However, the promotion isn't all divine perks. The previous Devil God has retired in secret, leaving Xander as a target for the world’s existing deities. If these powerful gods discover that the new Lord of Darkness is actually a panicked salaryman with zero combat experience, his second life will be even shorter than his first. To survive the impending divine purge, Xander must play a dangerous game. He has two paths to power: harvesting the raw negativity and misery of mortals, or gathering "Faith Power" from loyal followers. Now, the man who couldn't even stand up for himself in a staff meeting must learn to command legions, manipulate the shadows, and build an empire of the damned, all while keeping his true identity hidden from the heavens. The cubicle is gone. The keyboard has been replaced by a throne. But as Xander begins to recruit his first followers, he realizes that being a god is a lot like being a manager, only the stakes are eternal, and the "human resources" department is literally a pit of souls.