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.As the world continues to descend into chaos, the Knights of the True Cross reel from the loss of two of their most powerful Arch Knights, and Rin and Yukio continue their attempt to penetrate Satan’s labyrinth. Other teams of Knights and Exwires also work their way through puzzles and deadly traps, and fight off demonic ambushes. The sacrifices of Arch Knights Osceola Redarm and Lucy Yang must not be in vain, and Rin and his friends are going to do whatever it takes to win!