There are two Sunset Shimmers. One from the land of Equestria. The other, somewhere on the planet. What happened to the Sunset Shimmer of the EQG World? You'll find out soon enough.
A continuation within the universe of Spike the Fairy. This is a six-chapter series.
Inspired by a movie that will be revealed within the story.
(Watch out for spoilers in the comments. You've been warned.)