Summer is coming to an end, and the girls are getting ready for college. All except one, Sunset Shimmer, who feels anxious and uncertain about her future. But before she can figure things out, a new problem arises: their magical geodes have begun mysteriously disappearing one by one. (Based on the unused story concept by Nick Confalone for Equestria Girls) While the girls face this troubling mystery, another truth lingers in the background. The powerful ancient Equestrian spell Sunset once cast to open the portal created an imbalance that was never fully resolved. Her arrival in the human world displaced someone, an innocent character we've never seen, yet whose absence is felt every time Sunset is on screen. In this version of the story, we'll finally uncover what really happened to the human Sunset Shimmer.

Dans le troisième film Equestria Girls : Les Jeux de l'Amitié, la seconde version de Twilight Sparkle, dans ce monde une intello solitaire dans le lycée de Cristal, rentre en contact avec la magie d'Equestria lors des Jeux de l'Amitié. Elle fini corrompue par la magie qu'elle essayait de comprendre, mais Sunset bat sa version démoniaque Midnight Sparkle et la ramène, à l'instar de la Jument Séléniaque dans la série. Mais si Sunset avait échoué et que Midnight Sparkle avait réussi?