Twilight Sparkle. Princess of Friendship and Magic, just screwed up. Having realized that she had friends long before she met Applejack, Rarity, Fluttershy, Pinkie Pie and Rainbow Dash, she journeyed back to Canterlot to reconnect with the ponies that she once took for granted. She finds forgiveness and acceptance from Twinkleshine, Lemon Hearts and Minuette, but none in the forth, her long lost friend Moondancer, whose party she did not attend on the day she was ordered to Ponyville to oversee the Summer Sun Celebration. Moondancer has since become a bitter recluse, living her life alone, buried in dusty old books in her decrepit home and the city library. And completely against making friends ever again.

Desperate to correct her mistake, Twilight devises a plan but before she can implement it, she is paid a surprise visit by Discord, who make an offer that Twilight, in her desperation, simply cannot refuse...