Back then, Princess Twilight Sparkle entered the human-world to chase Sunset Shimmer for her missing Element of Magic. However, there was a catch: Her friends could not enter, because all six Elements of Harmony would have reacted differently in the other world, and thus cause untold chaos and destruction. This left Twilight to instead rely on her friends' alternate selves, while her friends were left behind to wait for their only friend and leader.

And now, back at her library, Twilight now summons her friends to go on a brand new quest! To compensate for their inability to accompany her into the human-world, Twilight sends them to a second Canterlot High, one that has an alternate version of the adorkable princess herself, but no alternate versions of her friends. There, the human Twilight has no friends nor want any, and it is up to her pony-self's friends to teach her about the magic of friendship. And, much like Twilight's trip into the last Canterlot High, it would involve two things: An alternate Sunset Shimmer, and the Fall Formal Princess Pageant.