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. In this universe, the girls never got their geodes, and so they don't have super powers. Other than Stands. And because Twilight never came over, she never faced the Sirens in a Battle of the Bands.

This takes place between SuShi part 2 and 3.

With this being the case, Twilight Sparkle has never been to the human world, since Sunset never stole her crown.
---I>>>>>>>]
Something strange is happening in the human world. After spending many years honing their new abilities, Stand power, the Sirens have decided it was finally time to put their plan into motion: Their return to Equestria to rule over it with an iron fist. But not all of them agree with this plan and Sonata Dusk, having grown accustomed to this world, turns against them. On the run, she would have to forge unlikely friendships and worse, fight against her sisters and their minions to protect the people of this world.

On the other side of the mirror, Princesses Celestia and Luna, days from retiring as rulers of Equestria, sense the coming danger and decide to hop through it for one last adventure, a rather strange one at that.

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This is a bizarre collaboration between the minds of Myself, Golden_Reflection, Tokurider45, and Jojoleopard.