An E.Q.U.E.S.T.R.I.A Spies story

After dusting out a few pieces of equipment in an old basement at Canterlot High School, the two Rainbooms, Pinkie Pie and Fluttershy, discover a mysterious book that is a key to unlocking another portal by the statue to a THIRD world. Opening it, it causes the strange new residents within it to spread across this world. A man from this new place named Steven Secret meets them and the other Rainbooms and claims to be a high school principal, and that opening the book caused his whole school to be transported here. He then informs them that while it’s nice to discover and make new friends, they will also discover and make new enemies. Fearing that their villains will combine with his villains, Steven asks the Rainbooms to team up with the heroes from his world, Lightning Star and Karly Crystal, two teenage spies, and set everything right; tracking and rescuing his students, defeating all the villains and bringing everyone back into the portal safely.