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.

Ever since she was a child, Shiemi's destiny was tied to the Grigori. Though her childhood memories of training to be Shemihaza faded, her desire to help her friends never did. Now, her powers give her strength in ways she never imagined. But when it comes to her feelings for Rin, she has always been torn. Rin himself has never seemed able to confront his own feelings for Shiemi. Now, with the world in chaos and a great battle taking place all around them, perhaps it's finally time for Rin and Shiemi to have a little heart-to-heart talk!