Rin is thrown into turmoil when Shiro tells him that he's the son of Satan! But this doesn't stop the demons from unleashing a brutal attack. Warning him that he must never draw it, Shiro gives Rin the Koma Sword, and hides him in the monastery basement. Outside, a fierce battle begins - it's Shiratori, who's morphed into a giant demon, versus the exorcists! Just after Shiro manages to end the battle, Rin turns on him in a rage: ""Don't act like you're my father!""
Vowing to become an exorcist, Rin is taken to True Cross Academy by the mysterious Mephisto, a friend of Shiro's. The colossal, fortress-like school; Yukio at the top of the class - it's all so mind-boggling for Rin!
Later, Rin heads to the Exorcist Cram School, as Mephisto warns: "No one can know that you're the son of Satan."
When Yukio takes on a case, Rin tags along with him to the Exorcism Supply Shop. There he meets Shiemi, a girl with ailing legs, tending to her garden. Shiemi seems devoted to this garden, as it was left to her by her late grandmother. Just then, Yukio shows up to examine Shiemi's legs. Finding demonic traces, he speculates that the garden is the cause.
Rin is always snoozing in class, much to star pupil Suguro's irritation. He's striving to become an exorcist so he can restore his family's temple in Kyoto, and being classmates with such a slacker is more than he can bear. Both are hot-tempered and quick to fight, so it's not surprising when they finally clash one day!
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!
Southern Cross Monastery, where Rin and Yukio grew up, has come under attack by a mysterious assailant! Leaving behind these cryptic words: "I will never forgive anyone related to Satan," the masked assailant escapes...
The assailant has escaped, but the monastery attack case is winding down. Just then, an elderly man calling himself Ernst appears before Yukio. He reveals the secret of Yukio and Rin's birth, as well as what the Vatican did their mother. Shocked, Yukio also begins to harbor doubts about the Knights of the True Cross. Meanwhile, the injured assailant has stumbled into Shiemi's garden at the Supply Shop...
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...
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