Twilight Sparkle awakens one morning to find all of Ponyville wholly consumed by a spreading cloud of white. Hopefully The Stranger inside her castle can help her understand what this all means.
As kids, Twilight and Sunset were best friends, but a tragic accident cut their friendship short. Years later, Twilight investigates the incidents at Canterlot High and comes face to face with what appears to be a literal ghost from her past.
In the land of Equestria, there are no differences, no heartache, no progress, no purpose. There is just life, and whatever comes after. Everypony is equal. Starlight Glimmer won, but she may have also lost.