Exorcists Undercover--Trick Of The Eye

When Allen, Kanda, Lavi and Lenalee are sent undercover as students to a school, they're thrown into a whirlwind of crazy teachers, disappearing classmates, secret passages and drama galore. As the pieces of the puzzle start to fall into place, and the dark secrets behind the school are revealed, they realize that the school is a deathtrap, with them caught in the middle.