Magical Explorer, Vol. 7 (light novel)

Marino Hanamura receives an urgent request for assistance from Amaterasu Girl's Academy, where countless students have lost their powers in an act of Magic Terrorism. Fortunately, Marino knows just the person to help resolve the incident: Kousuke Takioto. With a little help from some angel magic, Kousuke becomes a girl and transfers into Amaterasu Girls’ Academy to get to the bottom of things.