There are monster like entities that roam the world. They are called dopplegangers because they will take on the form of the victim they have killed or they mind control the victim. Only a small select few can see them and notice the signs of one. The world goes on with people not knowing they exist except the few. The few that can see them and find them end up hunting them. Y/n is able to see them. Knowing that, what will you do to survive this new world?