"With a class of students about to graduate, the Summer Sun Celebration just around the corner, and a brand-new princess of friendship in her realm, Princess Celestia is more than just a little overwhelmed. Her sister, Luna, suggests she enlist a guest professor to help out during the last few weeks of the academic year, and Duchess Diamond Waves from the land of Monacolt is more than happy to help. Things look great at first, but Celestia soon notices...

"Discord is a relatively new student of the Magic of Friendship. So when he receives a secret invitation from Princess Celestia to join the ponies of Ponyville in their Spring Musical, he jumps at the opportunity to practice what he's learned so far. Things go as smoothly as they can at first, but it's not long before the former king of Chaos seems to leave a trail of disaster in his wake and every pony second-guesses including him in their community...