An anime about demons? The heck you say.
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.
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!
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...!
Senior Exorcist First Class Shura Kirigakure stops the battle between Rin and Amaimon. She is an undercover Inspector from the Vatican Headquarters, posing as a cram school student to spy on the Knights of the True Cross. Dragged off to the underground base, Rin learns that Shura was once a disciple of Shiro's - and that Shura has targeted him for elimination - "the job that my mentor failed to do!"
The first semester has ended, signaling the start of summer vacation for True Cross Academy students. But there's no rest in sight for Rin and the other ExWires: first they must take part in a 3-day drill to prepare them for actual combat, under the guise of a camping trip out in the forest.
Suguro's joint strategy pays off, and the ExWires have success in their sights! But then a gigantic moth demon (chuchi) appears, and attacks Rin the moment he lets his guard down!
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