St. Rita's Preperatory School is an all-girls boarding school that is run by Madame Margaret, with Girl Squad as the school's security guards. When boys are sent here, they arrive at the school only to be girlified. The school can transform into a giant robot in order to chase after escaped students. 75 years later, it becomes a training academy for all girls being recruited by Margaret, where they planned to turn the BND (Boys Next Door) into girls.