Bloodthirstiness… The desire to kill someone… These strange to some concepts have always chased people. And even if you deprive them of all technologies, opportunities, and knowledge, they will still look for a way to kill and maim. At best—to hurt. But they will never refuse the chance to spill someone else’s blood. After all, even knowing about countless blood-soaked wars in the past has never stopped them. It’s as if the memory of such horrors simply erases… Someone powerful and very cruel. Someone who is running a terrible experiment on Humanity.