The world has turned into Hell's Game, why should I stay human?!

Welcome to Hell’s Game.
[Entering instance: Bloody Restaurant]
[The position you applied for: Delivery Person]
[Your customers include: a fat otaku emitting a corpse stench, a maid who bursts at the slightest disagreement...]
[Your colleagues include: A boss who's too pretty to be human, A cow or a horse in the literal sense, a man-eating tree that swears in French...]
Facing these incredible characters, Liu Zheng, who wanted to be a decent person, had no choice but to give up on humanity.