During her usual evening stroll through the grassy plains surrounding Ponyville, Twilight comes across a crying mare whom she never expected to see there... Or crying, for that matter.
Sunset Shimmer is Celestia's prized student. Cadence is Equestria's newest princess. They never really got along well, but after Cadence's coronation, it just gets worse. Especially now that Celestia wants them to be... best of friends?