Fate/World - Chapter 106

Jack regarded himself as the greatest failure in the world; a broke unemployed law student who does nothing but laze around all day.This was until he was chosen by the Urban System.[Urban System Activated.]With its activation, the system elevated him beyond ordinary, gifting him the kind of video-game skills only protagonists possessed… and exposing the world’s real, long-buried truth.In reality, no human in the world was actually human. Everyone were descendants of fantasy races, each possessing strange powers and abilities that was supposed to exist only in myths and legends.Moreover, with the activation of the system, he had inherited the fate of the previous user who live the truth of the world all his life.Now Jack must confront that destiny, facing the dangers of a world far more fantastical… and far more perilous… than he ever imagined.

Among the demons, the supreme ones are called “Great Saints.”

A young man leaves his mountain village and travels around the world. By unceasing efforts, he finally becomes a legend of the age.

- Description from Novelupdates

To pass as an imperial concubine, one must be professional.

Actually, the profession of an imperial concubine is pretty good. The emperor will accompany you in eating and drinking, and even pay you for it. What’s not good about that?

- Description from Novelupdates

Vainqueur Knightsbane is your average dragon: a giant, fire-breathing lizard who loves to take naps on his golden hoard, kidnap princesses for fun, and make the life of adventurers miserable. Vainqueur's only pleasure in life is to watch his treasure get bigger, one coin at a time.

So when a would-be thief turned unwilling minion tells him about "classes," "levels," and "quests," Vainqueur wonders if maybe, just maybe, he should consider a career change.

After all, why bother hunting monsters for free when you can get paid for it?