The year 2025 was when science announced about its biggest discovery... monster hood.. the world where some kind of creatures not known on our planet lived peacefully before humans imprisoned and forced them to do all kinds of work as if they were some kind of animals or machines... even though some could talk a foriegn language they ignored them and put a collar around their necks as if they were slaves... after a while there were even schools to teach how to control and deal with them so governments could make them enter our everyday life... in the middle of all of this chaotic events an organization started to break in to factories that locked up monsters inside of them and freeing them all then destroy those factories and flee away ... no one knew what's their purpose nor how they did it... the weirdest thing is that they can even control monsters without any collar and after fleeing none of these monsters was found ever again.