Princess Celestia and Princess Luna wanted to retire from their Royal duties, and place Princess Twilight Sparkle, Pinkie Pie, Rarity, Rainbow Dash, Fluttershy, and Applejack as Equestria's new rulers. But after more thought, they realized that it may be too much too soon for Twilight and her friends.
But after Twilight and the others were back at Twilight's castle, as they talked, they eventually figured out that they may be much more ready than they gave themselves credit for, except maybe Rainbow Dash.
Unfortunately, there was another very important fact that they, even Twilight, all overlooked, and may not be discovered until it's too late...