The mysterious Table of Harmony has called on Starlight Glimmer to solve a friendship problem at Canterlot Castle, but wait! A second cutie mark belonging to a magically inclined alicorn has appeared, and unfortunately for Twilight, it’s not hers.
Sunset Shimmer, practitioner of friendship, twice savior of Canterlot High, alicorn. She's offered to help Twilight's new student as the whole group travels to the Crystal Empire for a Crystalling. Should be a relaxing, stress free trip. Right?
Sunset Shimmer and Twilight Sparkle have a few drinks together... Okay, maybe more than a few. This is followed by a desire to do some science. This simultaneously goes much better and much worse then the girls would have expected.