Twilight offered Starlight hope and friendship, and she knew after that everything would work out. That was how everything worked out, right? The magic of friendship solved everything, no questions asked.
Except this time, it didn't. This time something went wrong. This time Twilight, Spike, and Starlight are stuck in a time loop that keeps changing over, and over, and over, and over.
Now they have to escape from a time loop, and the different Equestria universes that come with it.