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 a world where all living things are infected with nanomachines, only Sunset Shimmer has the power to cure the rampaging EVOs that threaten mankind. But what's in it for her?
Alone and afraid, Sunset Shimmer has been living off of the streets in Canterlot ever since she ran away from home. On a particularly cold night, she's out searching for something to eat when she bumps into the last pony she expects to see.