After a long term at Canterlot High School, the Rainbooms and Human Twilight can't wait to go on their camping trip to the Everfree Forest. A veritable utopia of flowers, trees, wildlife, and more, it seems the perfect place to bunker down and relax for a while.

Or at least, it would be, if it wasn't facing the threat of being cut down by the ruthless Ms Miasma, who wants to create a new city in place of it. With the forest almost bankrupt, it's up to Sunset Shimmer, her friends, and a mysterious girl named Gloriosa to save it from the wicked Miasma.

But what secrets does the forest hold? What is Miasma's true intentions? And who is Gloriosa?