It's been 8 years since Cheerilee's class graduated, and the reunion was going very well. Emphasis on "was." The details of what happened are unclear, but once it was over, ten former students had vanished, leaving Nova, a friend of Sweetie Belle's, as the only one who was there. Too bad she can barely speak Equestrian. Now Nova has to go figure out where her new friends vanished to and rescue them.