fairy tail x blue exorsist

OK so I really like fairy tail and blue exorist but there really isn't that many crossovers of them so I'm going to try one but I don't know how well it's going to turn out :) and just so you know I suck as descriptions descriptions (i don't own either anime)

what happens when the true cross academy cram school students are chasing a demon with the ability to travel to different worlds accidently get caught up in it's escape plan and end up in a town called magnolia in a place called earth land. they mistake a Vulcan as a demon and attack it.