Blue Exorcist Vol. 2 (manga)

Shocked by the death of his foster father and the revelation that his real father is the demon lord Satan, Rin Okumura enters the True Cross Academy to learn to be an exorcist. But every great exorcist has to start somewhere, and for the students of the academy the first step is the Esquire examination. To prepare for the exam, the new pages in Yukio’s class must undergo intensive training. Rin and his classmates have their hands full when a demon appears, but is this a test or something more sinister?