Datenshi Gakuen Devil Paradise

Three students—Kotori, Yuuto, and Rin—are trapped in their school after the principal loosely calls forth a group of demons. The demons offer pacts to the students in exchange for taking control of their bodies. Many students ask for superficial changes like better looks or longer legs. Yuuto tries to stop the demon-possessed students, while Rin defeats the demon inside her. Yuuto eventually makes a deal with a demon to restore the school to its original state. The school is now in chaos as each student is taken over by a demon.