Blue Exorcist: Kyoto Saga

After learning that one of their own classmates, Rin Okumura, is the son of Satan, the ExWire of True Cross Academy are overwhelmed with horror and shock. They are currently more concerned about the theft of the strong demon's left eye from the academy's Deep Keep than they are about Rin's parentage, though. Rin and the other ExWires are assigned to look into the mystery surrounding the Impure King and the thief's ultimate objective when an attempt is made to take the right eye in Kyoto as well. While they are now working together on this mission, Rin has never felt more isolated from his fellow exorcists. He receives specific training to manage his dark power in an effort to make peace with them. But soon after they arrive, the right eye is taken, and the unthinkable threat of a traitor among them leaves them in need of all the strength they can muster.