Twilight Sparkle has always had a special place in her heart for Princess Luna. So when she hears that Luna is seeking a personal student of her own, she jumps at the chance and is excited when she is chosen.

As time passes and Twilight grows closer to Princess Celestia's own personal student, Sunset Shimmer, more and more questions are raised.

What really happened a thousand years ago that lead the sisters to live in two different capitols? What was the Elder Magic that Sunset was at the center of?

And what do Celestia and Luna mean they're retiring and handing ruling Equestria and the sun and moon to Sunset and Twilight?!