Blue Exorcist: Shimane Illuminati Saga

Rin Okumura's twin brother Yukio is dealing with a heavy workload at True Cross Academy, balancing his education, exorcist duties, and teaching position. Rin, however, sees an opportunity to make a new friend when ordinary people start gaining the ability to perceive invisible creatures in Assiah. The True Cross Order discovers an artificial gate to Gehenna, revealing their involvement with the Illuminati, a wealthy and powerful organization.