Rin is always snoozing in class, much to star pupil Suguro's irritation. Suguro'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.

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. Yukio examines Shiemi's legs and finding demonic traces, speculates that the garden is the cause.

Vowing to become an exorcist, Rin is taken to True Cross Academy by the mysterious Mephisto, a friend of their late father. Later, Rin heads to the Exorcist Cram School, as Mephisto warns: “You must keep that you’re the son of Satan confidential.”

Rin is thrown into turmoil when Shiro tells him that he's the son of Satan! 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...

Senior Exorcist First Class Shura Kirigakure stops the battle between Rin and Amaimon. 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 class investigates ghost sightings at an amusement park. Rin is partnered with Shiemi, and they find the ghost of a child. He runs away, turning things into a game of tag! Separated from Shiemi, Rin is confronted by Amaimon, King of Earth.

Rin, Shima and Izumo have been sent on a mission, only to end up working instead. They meet a boy named Yohei and learn of the "Demon of the Sea." Yohei lost his father to this monster, and wants revenge. Worried, Rin and the others watch over him.

After the excitement of being promoted to ExWire, Rin is soon disgusted with his load of homework. Then, Yukio is summoned for an urgent mission! The familiar of the Knights of the True Cross has gone berserk, and Yukio has to deal with the crisis.

Rin Okumura begins to worry about his future as his twin brother,his twin brother, Yukio, is starting school at the prestigious True Cross Academy. Sent to a job interview by his foster father, Shiro, Rin encounters a demon-like creature and causes havoc in the store.

Mizuho is reluctant to visit Kizuki's house for dinner while her dad is away. Meanwhile Shin tells her that

Kenshin and Aoshi engage in a battle on the deck of the ironclad Rengoku. Behind the scenes, Sanosuke manages to board the ship and tries to blow up the engine room with the explosives he got from Tsunan. However, Shishio's underlings Hoji, Shuzo, Toshiro prevent him from going any further. Meanwhile in Kyoto, Arato faces off against Kamatari and Henya alone to buy time for the police forces to evacuate.

President Kokuryu of Dragon Bank makes Gaku, Haru, and Kedoin an offer they have no reason to refuse.

Mizuho goes out with Shugo and Togo and strongly contemplates her feelings for Kizuki.

Suzuran's group prepares to move to Shitoron's settlement.

Momohime urges Sakko to explore his feelings for Sun before another Beast attack threatens the whole universe.

Kairin plots, Mortis clings, Nyamu is in a pinch, and Hatsuka is consumed with thought. All sorts of intentions become intertwined.

Ein travels to Rayshik to fight demons, but once there, Lord Nigun claims no demons had ever been sighted.