About Knowing I'm a Monster

In the year 1900XX of the Monster Era, or 20XX AD, the demons, an ancient race from thousands of years ago, came to harm the world. Due to the meteorite strike hundreds of years ago, there were less than a hundred souls left. There was a huge disparity in strength and number. Now the only ones who can save mankind are the demons that have existed for tens of thousands of years. The demons that the crystal ball talks about are the demons living in the human race!