Fourthprimogenitor Stories

What if Akatsuki Kojou was The Fourth Primogenitor? A primogenitor which wasn't divided or sealed away? One which hasn't created is own kingdom and stayed in the dark of our history, staying an urban legend. And what if Kamijou Touma is far older than what it look like? Is he even human? What if the two world were connected in some strange way? Here is the story!