Yggdrasil’s Developer

The story follows a man that was reincarnated into the future, or so he thought. Instead, he was reincarnated into the world of Earth 2138, where he found a job as a developer for a game. "Hmm, I must have seen this game idea somewhere, it seems familiar," "Wait, isn't this Overlord?!?!" Note: Not a plot following fanfic. Rewriting some mistakes made in the early chapters.