Sudsy Bubbles spends her lonely days working at her laundromat. But try as she might to attract customers, no one ever comes to wash their clothes. That all changes when a blue-haired girl comes looking for a place to hide.
A year after the battle of the bands, graduation nears, a familiar face returns, a pure heart is corrupted, enemies become allies and the fate of all reality hangs in the balance.
A heroine instead of a villain, Sunset Shimmer becomes a leader to her friends at Canterlot High. She begins by helping Sonata Dusk after the Battle of the Bands...
It's not bad enough Sunset Shimmer has to get a band together to save Canterlot High from zombification; she's still not over Flash Sentry! What's a girl to do?
After the student body of Canterlot High is swayed by yet another surprise musical number during lunch, Sunset Shimmer muses the students are easily influenced by songs at this time. Pinkie quickly comes up with a song of her own.
After witnessing abuse at the hands of Adagio and Aria, Pinkie Pie comes to the aid of Sonata. The two quickly hit it off and a friendship is born… much to the dismay of everyone around them.