Level 4 Human in a Ruined World - Chapter 31

Story about human babies raised by monsters in a world of sword and magic.

Allen is an orphaned boy that had lived a rather pleasant life with his orc mother in the bowels of a deadly dungeon, until the day a band of humans ventured down to loot and pillage the home they had come to think of as safe.

They took everything that Allen had, and drove him further away from the humanity. In anger and anguish, Allen turned his back on the humans. He encapsulated himself in a deep-seated hatred of them, refusing to associate with them in any way—even going so far as to reject any attempt at kindness.

Allen begins his journey in a world of human with full of deceit, danger, envy, and politics.

He said coolly: “One million a month, stay with me!” She raised her eyebrows and smiled: “Pay a 30% deposit first, no credit!” Show no mercy. When the contract expired, she turned around gracefully, and when he chased after her, she found that there was already a kid the size of a kid beside her…

- Description from novelbuddy

In a world fraught with innumerable dangers where living day by day is a struggle, a young man from the modern age transmigrated into such a world, accompanied by a peculiar system made for assassination.