Becoming a God in Game of Thrones

An office worker from the 21st century unexpectedly found himself in the world of Game of Thrones, only to start out in the Night King's embrace.

"Big boss, can you let me go? I want to go home."

The Night King, displeased, wanted to kill him.

This is the story of a half-Other, half-human male who, after slaying a god, ultimately grew to become a demon lord.