This story is a sequel to The Pony Guard: Rainbow Rocks

It is time for the upcoming Friendship Games against their long time rivals, Crystal Prep Academy. But, when the Magic Mirror in Equestria begins acting strangely and traps Kion and Twilight at Canterlot High, the rest of the Lion Guard come on over in an effort to figure out what happened. Along the way, they meet up with Sunset Shimmer and the Rainbooms, who are also struggling to understand how the magical "pony-ups" work.

As if preparing for the games and trying to launch the investigation isn't enough, their discovery has come to them discover that the two curious also investigating the magic mystery happen to be both... Twilight Sparkle and Kion's alternate human forms.

In the battle of competition, who will win? Or will whatever strange magic flowing around will cause more problems and uncover something that might be too powerful and sinister for both the new Twilight and Kion to handle?