Ao no Exorcist

Synopsis

The academy is ordered to be closed down following the events the previous day. Armed with special weapons that drain the blood of the demons killed with them, the Exwires take part in Operation Jacob's Ladder, a widespread crusade to erase all demons from Assiah. Rin and his friends start questioning why the True Cross Order decided to take such extreme measures, but Yukio is determined to accomplish his task as Ernst claims that it is all part of their plan to destroy Gehenna, meaning both Yukio and his brother would become completely human again. At a campsite, Yukio shoots down a boar-like demon called a yamakujira, causing Rin to be angry, but unable to fight back. Rin is arrested, running into Mephisto, who actually used to work in the Polish laboratory to create artificial life, in which Neuhaus was one of his employees even after he resigned from the laboratory. After Mephisto escapes, Rin is sentenced to death by Ernst, who plans on using him as a living sacrifice to open the Gehenna Gate, a living demonic doorway between Assiah and Gehenna. Yukio attempts to intervene while Shura fights Arthur to allow time for the others to reach them. However, when their classmates come to help them, they find that Yukio's demonic powers had also awakened.

(Source: Wikipedia)