Saito High is a high school with spiritual creatures and a principal who collects occult artifacts as a hobby. The school is guarded by prophecy-chosen members of the Holy Student Council. These kids have their own issues; the president, Haruto Houjo, has a way of calling spirits and would quit from his role for a regular existence if it weren't for the principle. The next member, Kazumi Ryodo, is skilled at being possessed and has a message for Hanako. Mutsuki Asahina, a master of exorcism who is drawn to tiny boys, is the final member. Unfortunately, these three are in responsibility of maintaining the school in order and safeguarding the planet against supernatural entities, and this purpose propels them forward.