Angel is missing along with all the other animals that live in Fluttershy's house. She searches for her friends deep inside the Everfree forest. There she finds somepony who knows the reason of the animals disappearance.

In order to find Angel, Fluttershy and her friends must cross an underwater portal created by an ancient pre-equestrian magic that leads into an unknown far away world.

Unknowingly, she starts a dangerous journey, into what will be for a really long time, Fluttershy's new world.