After Trixie convinced Twilight to send Starlight away to Canterlot, she thought she had it made. She had a princess completely under her control and used a fertility spell Twilight wrote to get her pregnant. Since then, Trixie has kept Twilight from having any visitors and is anxiously awaiting the birth of her foal. One thing she did not anticipate though is that after being sent away, a disaster struck Canterlot and it was up to Starlight to save Equestria. For saving Equestria the way she did, Starlight was transformed into an Alicorn and crowned "The Warrior Princess."
Now that things have returned to normal, Princess Starlight's attention can turn from military affairs to saving the pony who took her in as a friendship student a year ago, Princess Twilight. She will not be alone though as Celestia and Twilight's friends also want to remove this spell from Twilight. While wiping out Chrysalis and her changeling army was not overly difficult for Starlight, saving Twilight may actually be tougher than she thinks.