After having an encounter with a demon, Rin Okumura learns that he is the son of Satan, the most powerful demon ever. Satan possesses the body of Rin's guardian, Father Shiro Fujimoto, and tries to drag him to the demon realm, Gehenna, but Fujimoto sacrifices himself to protect Rin, who is forced to unlock his demonic powers to escape. On Shiro's funeral, Rin asks the True Cross Academy's chairman Mephisto Pheles to let him enroll there to become an Exorcist and confront Satan himself, but much to his surprise, he learns that his twin brother Yukio is already a full-fledged exorcist and will be his teacher.

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After having an encounter with a demon, Rin Okumura learns that he is the son of Satan, the most powerful demon ever. Satan possesses the body of Rin's guardian, Father Shiro… Развернуть 

Rin becomes aquainted with his new classmates and together they take part on the Exwire exam to get one step closer to become exorcists, but while waiting for the exam to begin, they are attacked by powerful monsters, and Rin must find a way to fight back without revealing his demonic nature to the others, unaware that one of the teachers is also after his life.

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Rin becomes aquainted with his new classmates and together they take part on the Exwire exam to get one step closer to become exorcists, but while waiting for the exam to begin,… Развернуть 

One of Fujimoto's familiars cause a commotion after learning of his death and Rin, now an Exwire, manages to calm it down and becomes its new owner. But the True Cross Headquarters sends Shura Kirigakure, a former student of Fujimoto's, to investigate about Rin and dispose of him after confirming his connection with Satan. Seeing Rin's determination to become a Paladin, the highest ranked exorcist just like his guardian once were, Shura decides to spare his life and aid with his training instead.

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One of Fujimoto's familiars cause a commotion after learning of his death and Rin, now an Exwire, manages to calm it down and becomes its new owner. But the True Cross… Развернуть 

While taking part in a special training camp, Rin and his classmates are attacked by the demon Amaimon and he is forced to reveal his secret to protect them. Then he is captured by Arthur Auguste Angel, True Cross' current Paladin, and brought to the order's top echelons to be judged. Mephisto Pheles intervenes on Rin's favor, claiming that having him live and become an exorcist could help the Order to get an upper hand against the demons and the Order declares that he has six months to pass the exorcist exam, thus Rin starts his special training with Yukio and Shura.

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While taking part in a special training camp, Rin and his classmates are attacked by the demon Amaimon and he is forced to reveal his secret to protect them. Then he is captured… Развернуть 

Rin and Yukio fail to prevent a powerful demonic relic, the "Left Eye of the Impure King" from being stolen, and they set with the other students to Kyoto to help the exorcists there who are keeping guard on its counterpart, the "Right Eye of the Impure King". To complicate matters, Rin must deal with the estrangement from his classmates who are avoiding him since they learned that he is the son of Satan.

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Rin and Yukio fail to prevent a powerful demonic relic, the "Left Eye of the Impure King" from being stolen, and they set with the other students to Kyoto to help the exorcists… Развернуть 

The "Right Eye of the Impure King" is stolen by Mamushi, one of the Myoda students who claim that the True Cross Order can not be trusted for sheltering the son of Satan. High priest Tatsuma, the leader of the Myoda, rushes to follow her but not before being confronted by Suguro, who also happens to be his son. To worsen matters, Rin confronts Suguro for being rough on his father and unwillingly reveals his secret to the other members of the Myoda who end up having him imprisoned. Before leaving, Tatsuma leaves a letter to Rin explaining about his connection with Fujimoto and the sword "Komaken" that is currently on Rin's possession.

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The "Right Eye of the Impure King" is stolen by Mamushi, one of the Myoda students who claim that the True Cross Order can not be trusted for sheltering the son of Satan. High… Развернуть 

Mamushi finds that she was decieved by her teacher and unwillingly helped him to awaken the Impure King. She rushes back to the Myoda asking to help Tatsuma and Rin decides to go to his aid. However, for some reason he becomes unable to draw his blade and he is locked in a special prison awaiting execution by the Vatican's orders. Rin's classmates learn about his situation and manage to break him free, and once again reunited, the Esquires join the Myoda to confront the Impure King, whose poisonous miasma threatens to ravage the city of Kyoto.

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Mamushi finds that she was decieved by her teacher and unwillingly helped him to awaken the Impure King. She rushes back to the Myoda asking to help Tatsuma and Rin decides to go… Развернуть 

While the other exorcists struggle to contain the miasma, Rin, Suguro and Kuro dive into the core of the Impure King to purify it. Yukio faces and defeats a stronger Todo who became immortal after consuming the energy of a phoenix with the help of the other Myoda priests. When Suguro's powers reach their limit, he asks Rin to run away while he still can, but he refuses to, and finally manages to draw Komaken again, awakening a spirit who infuses itself into the sword to help him control his flames against the Impure King. Meanwhile, Mephisto watches it all by the sidelines, acting as a mere spectator as the battle unfolds.

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While the other exorcists struggle to contain the miasma, Rin, Suguro and Kuro dive into the core of the Impure King to purify it. Yukio faces and defeats a stronger Todo who… Развернуть