Rin and his exorcist classmates are caught in a secret war against the forces of darkness. Raised by Father Fujimoto, a famous exorcist, Rin Okumura never knew his real father. One day a fateful argument with Father Fujimoto forces Rin to face a terrible truth--the blood of the demon lord Satan runs in Rin's veins! Rin swears to defeat Satan, but doing that means entering the mysterious True Cross Academy and becoming an exorcist himself. The heads of the various Myodha temple families gather to discuss recent events surrounding the Eyes of the Impure King. Revelations at the meeting only deepen suspicion of Suguro's father, Tatsuma, and angry accusations follow. Tatsuma's silence on the matter isn't helping either. Amid all the swirling distrust, Rin tries to make sense of things but struggles to keep his flame in check. Then Rin receives a letter that may shed more light on the current situation--and the secret past!