Death March to the Parallel World Rhapsody Novel Vol. 3 (novel)

Twenty-nine year old Satou just closed his eyes for a brief nap at work, but when he opened them, he found himself in a game-like alternate world. Fortunately, thanks to some excellent luck, his level is high, and his wallet is full.

After successfully saving the elf girl Mia from the evil Zen, he's set off to accompany her back to her village. Satou is enjoying his break from work and touring a brand-new world, but such a journey couldn't possibly end without a little adventure, right?