Quick note: This story takes place in an alternate reality where Sunset never left Equestria for power, instead, she left it because she felt everypony was turning against her. She also does this at a later point in time from the original Equestria Girls movie, and this now takes place sixty eight years after Sunset's adventure. In this universe, the girls never got their geodes, and so they don't have super powers. Other than Stands.
With this being the case, Twilight Sparkle had only been to the human world in the previous part, since Sunset never stole her crown.
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It has been eleven years since TWI had turned against her friends on their adventure together, set on righting a world on the brink of destruction. It was there that TWI had taken Sunset Shimmer away in hopes of finding a way to heal this world. Shiho Sunfast has been searching for signs of her grandmother and TWI all this time, and she may finally have a lead among the Polynesian islands when a mysterious girl, Subterra Shiver, appears.
Having lost her memory, they will have to work together with new allies to find out where she came from and why TWI wants her so badly. Once again, Shiho would have to embark on another bizarre adventure, in hopes that she can still save her grandmother.

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