The Exorcism Cram School students are having a ball with Shima's birthday-based fortune-telling. When they discover that Izumo's birthday is coming up, they hit upon the idea of throwing her a surprise party!

Satan has transformed himself into a gigantic Gehenna Gate, and is attempting to absorb all of Assiah. Rin and Yukio, joined by Shura and Angel, attack the gate. Meanwhile, at the school, the exorcists defend against a myriad of demons.