The Equestria Girls spend their spring break on a yacht. It's Spring Break and the Mane 7 are about to board the most glorious yacht ever for a relaxing cruise. But Rainbow Dash is convinced that Equestrian Magic is on the loose and won't let anyone rest until she finds it.

The story follows Sunset Shimmer, who (using her powers) finds out that her friends' memories of her have been mysteriously erased, resulting in them getting amnesia. Determined to set things straight, she'll need Princess Twilight's help from Equestria in order to find out the source of what caused her friends' memory loss.

When Canterlot Highschool goes on a trip to Camp Everfree, they’re surprised to find a magical force is causing strange things to happen around camp. With the help of the Mane 6 and especially Sunset Shimmer, Twilight Sparkle must confront the dark “Midnight Sparkle” within herself and embrace her newfound magical abilities to save the camp.