u/ForsakenHatred

MC was just a regular japanese man (possibly an accountant?) with no powers, but he was sent to a fantasy world with magic/elves/demons/dwarves.

He started a delivery/courier business that eventually got into all kinds of random goods. He even made cell phones from elven flowers and magic. He rescued a demon princess that was unconscious in a coffin, and she saved him later when the lord locked him up bcuz his business was doing too well.

I remember him making a Robot/Personal Mecha at one point and also meeting a lich that was also from Japan, while he trying to find a way to get back to japan.

Can't remember if the story ever had an Anime or not.