As the hearing drags on, the Order finds itself unable to decide on Rin's fate, as Mephisto has proclaimed him to be "a weapon for counterattacking Satan." Just then, something happens...!
Rin Okumura, a 15 year-old boy living in a monastery, begins to worry about his future when his twin brother, Yukio, leaves to start his academic career at the prestigious True Cross Academy. Sent to an interview for a part-time job by his foster father, Shiro, Rin ends up wreaking havoc in the store when he encounters a demon-like creature. Still upset by the unfair turn of events, Rin is called out by Shiratori, whom he fought with earlier.
The biggest headache of Rin's school life is his daily meals. Mephisto has only given him a 2,000-yen bill to live on, putting the swanky school cafeteria out of his reach! On Yukio's advice, Rin starts cooking in the dorm kitchen, preparing lunch the night before. But in the morning, all the food has vanished!
To overcome her shyness, Shiemi secretly vows to "Make friends!" But her attempts to approach Izumo are foiled by her klutziness. After displaying her Tamer skills in class, she finally asks Izumo, also an aspiring Tamer, to be her friend! But Izumo looks down on Shiemi, using her as an errand girl. Soon after, the Exorcist Cram School holds a boot camp in Rin's dorm.
Crushed by her failure to save her best friend, Paku, Izumo turns on Suguro in a burst of rage! Their bickering escalates until the whole cram school is involved, and they're all sent to detention together. Rin and the others are forced to endure long hours of holding low-level demons on their laps. Just then, the lights go out, and the students are attacked by the ghoul that Rin thought he'd repulsed the day before!
Fighting together for the first time, Rin and the others just barely survive a harrowing attack. The next thing they know, Mephisto and the cram school teachers are before them! This unexpected visit really unnerves the students. Meanwhile, sensing something odd in Noihaus's behavior, Yukio decides to confront the teacher, only to discover that...
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.
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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