Mizushino Aoi

Leader of the Shotou Academy's student council and Itsuki's eternal rival.

As the student council's president, Aoi makes sure that student activities, clubs and other affairs are running smoothly in school.

She was not happy when Itsuki filed the paperwork necessary to form the Occult Study Group. Aoi does all she can to get the club disbanded by relying on technicalities in the policies that involve the creation of clubs, as well as trying to get Yuuichi to help her disband it.