Not every wishing star is real, nor do those that are have any real power, but when three friends wish on one that meets both criteria, they end up in Equestria, missing more than a few years of maturity. Tossed into a new life because of a blotched attempt at wish granting, coping is going to be the first challenge they face in a world that isn't quite what they expected.
[Image made using generalzoi's pony creator.]