Blue Exorcist

Paku, who is recuperating from her injury, decides to quit the cram school, which really troubles Izumo. During Aria class, Izumo is unable to recite an passage for homework, so Ryuji recites it instead, much to Rin and Shiemi's shock. After an argument arises between Ryuji and Izumo, Yukio punishes the whole class by placing heavy bariyons, large stones with faces, on their laps. Just after Yukio leaves for a mission for three hours, the students are attacked and cornered by the same naberius from yesterday. After the naberius splits in half, Rin tries to lead the first ghoul away from the others, leaving it up to Ryuji to prove himself as an Aria against the second ghoul, while the other students protect him. Rin learns that the naberiusesr were sent by Neuhaus, who wanted to confirm that he is the son of Satan. Rin then kills the first naberius with Kurikara, yet missing his chance to confront Neuhaus. After Ryuji manages to extinguish the second naberius, Izumo thanks Shiemi for saving her during the attack. (Source: Wikipedia)