Rin Okumura, revealed to be the spawn of Satan as a result of Amaimon’s attack, comes under scrutiny from the Order of the True Cross as a potential exorcism target. He has begun training under his keeper, Shura Kirigakure, to learn to control the blue flames that he inherited from Satan. In the midst of all this, they receive word that someone has stolen the Left Eye of the Impure King, which had been sealed away in the academy’s Deep Keep. Rin and the others rush to the scene of an attack and go after the thief, but then…