After the excitement of being promoted to ExWire along with his classmates, Rin is soon disgusted with the heavy load of homework they've been given. Just then, Yukio is summoned for an urgent exorcism mission! The familiar of the Knights of the True Cross has gone berserk, and Yukio has been ordered to deal with the crisis.
Rin, Shima and Izumo have been sent on a mission at the shore, only to find themselves working at Ocean House... There, they meet a boy named Yohei, and learn of a monster known as the "Demon of the Sea." Yohei has lost his father to this demon, and is planning for revenge. Worried that he'll take on the demon, Rin and the others vow to keep an eye on him. Just then, the sea undergoes a bizarre change!
The class's latest mission is to search for a "ghost" spotted in an amusement park. Paired up with Shiemi, Rin can't shake off the feeling that he's on a date. They find the ghost, who keeps taunting them and running off, until the mission becomes a game of tag. Separated from Shiemi, Rin is confronted by the King of Earth - Amaimon! When he loses the Koma Sword to Amaimon, Rin finds himself being consumed by the power of Satan...!
In light of the incidents following the monastery attack, Mephisto is dismissed from his post as director. The Order's Supreme Advisors, the Grigori, are ousted as well, paving the way for Ernst to become Pope. And the newly appointed Preceptor of the Japan Branch is revealed to be...
Ernst is scheming to invoke the Gehenna Gate by using the blood of Rin, son of Satan. In order to protect his wounded older brother, Yukio offers to take his place.
Hordes of demons are spilling out of Gehenna Gate! And these intruders from the "Empty World" are now indiscriminately attacking the people of True Cross Academy Town! Meanwhile, on the roof of the school building, Rin has been rescued by Suguro and Shiemi and is starting to come to. What Rin sees when he awakens is...
Satan has transformed himself into a gigantic Gehenna Gate, and is attempting to absorb all of Assiah by expanding a rip in the dimension. Rin and Yukio, joined by Shura and Angel, attack the gate, but it's an uphill battle against Satan's overwhelming power.
Meanwhile, at the school, the exorcists are in a desperate situation, as a myriad of demons attack. Just then, Suguro proposes a strategy for a comeback! But will it work? Rousing themselves into action one last time, Rin and Yukio head toward the gate. To protect their beloved friends, and this world!
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