Princess Celestia knew how her kingdom worked. The Unicorns used magic. Pegasi flew in the sky and handled the weather. And Earth ponies... Earth ponies... Huh, maybe Celestia didn't know everything about her ponies. That was about to change.
After a thousand years of unchallenged rule, a humbled Princess Celestia - now called Tia Sunbeam - must face her ultimate challenge. To live life as a normal pony, and make some friends.