Edward Elric had one of the rarest Cores in the world, but no one could know that. Roy Mustang had one of the only Cores in the world that Ed could bond with, but he was a bastard with a god-complex. Now, because of said bastard and the military's insistence that the academy was important, they had to live together for two months. Ed had survived worse though... right?

After Ed restores Al, the two fake their own deaths and flee Amestris. To support them, Ed takes on the coveted position of DADA professor at Hogwarts… Harry Potter Crossover!