Celestia, despite all the horrors and catastrophes that have befallen Equestria over the years, comes to realise that there is an as-yet unsolved problem that is far worse than all previous blights to their realm. Her dearest student, Twilight, as well as her friends, are all single! Granted, the mares in question don't really have a problem with this, but even so, the princess of the sun takes it upon herself to rectify this situation.
Thus, the six unsuspecting mares soon happen upon a very special delivery from the good princess.