The story of Blueberry Blitz, a teenage mare who's faced with the troubles of transferring schools for the new term. She has to deal with the odd teachers, the unfamiliar classes, and not to mention her classmates! When she meets her five new friends, her seemingly bleak future at that school starts to look much brighter, and she thinks she might even be okay.
(Mainly OC, may have canon ponies as teachers or something, but that's it as there aren't any high school ponies mentioned in the show.)