Despite the luscious forests and calm atmosphere, the world has been injected with an aura of negativity and there is nothing that could cull it. Live with it, or die.
"This rule will remain active throughout the Killing Game! For whoever manages to kill Prairie Marble...gets to graduate scot-free! No need to wait for a perfect moment, kill her whenever you like! Kill her in front of her friends and lovers! Bring your kids!...