Twilight is more than upset when Princess Celestia becomes busy with royal duties and is unable to give Twilight her usual lessons. The princess sends her to Magic Kindergarten, and has her stay there until the business is cleared up. But Twilight is reluctant to have to learn with other ponies.
Soon, however, things get worse. Much worse. And Twilight doubts that she'll ever be able to succeed in magic, even when Princess Celestia returns.