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 transforms beyond comprehension, the Knights of the True Cross still struggle to save it. But they have paid a heavy price to get Rin and Yukio's team into the labyrinth surrounding Satan's stronghold. While Arthur A. Angel and the others keep up the fight against Iblis, the infiltration teams push toward their objectives. But the labyrinth isn't just a simple maze--it's also filled with deadly traps! Despite the danger, Shiemi is no longer the timid girl she once was, and with her newfound confidence as the Saio, she takes the lead. As the labyrinth closes itself off behind them, the Exwires must keep going forward. The only way out is through!