Why are you Doing Things in my Backyard?

Well, it seems all those explosive and violent happenings going on all over Area Elev- sorry, Japan have finally taken their toll. Most of the country is ruined after too many Ordinary High School Student Embarks into Adventurous Journey incidents. Mahora's pretty much the sole school standing. So it's time to get serious for some... fanservicey wacky hijinx! Or is it?