Angel of Darkness Volume 1(淫獣教師 1)

Atsuko and Sayaka think they have it made when they are both accepted into the same prestigious women's academy. There, they will be free to explore the intense passion of their relationship, unbounded. But when the mystical bonds imprisoning a hideous ancient evil that feeds on the lust of nubile women are accidentally broken, the two young lovers soon learn they have more to fear than final exams.