Ousama Game: Kigen or King's Game: Origins is way better than Ousama Game(the one set in the school setting) so if you read that one and just because you didn't like it. Please read this one. I gave this manga a 9/10 because in my opinion this manga is so good.

Art
The art is so beautiful. The first thing I look at before reading a manga is the art so if you're like me you will enjoy this one.

Story
I don't want to spoil you but the ending is not that good BUT the overall story is better than the Ousama Game(high school setting).

Characters
The characters in this one are more human like. They will do anything to survive and when I say anything I mean ANYTHING.

Compared to Ousama Game(high school setting) Kings Game Origins is a real battle royale. Villager against villager the characters will do anything to survive (they will kill, deceive, whore their way to victory, and pretty much sell their soul to the devil just to survive).