Fate/kaleid liner Prisma Illya. It's a magical girl interpretation of the Fate series. Even the male characters from the other Fate shows seemed to have been turned into female characters in this one.
Negima!?: Negi Springfield, a VERY young teacher at Mahora Academy, teaches this class FULL of girls. At the same time an all-girl class. In fact, from what I can tell, Mahora Academy is an all-girl school/a school for girls