A millennium It's been; Princess Luna Isn't coping with it well…
After her banishment, and even after Nightmare Night, Princess Celestia finally has some time with her sister for a little while, and during a discussion, she soon realizes how far behind she is with the modern Equestria. Princess Luna decides to attend a boarding magic school for unicorns; and learns how to speak modern, as well as learn the history between now, and all the back after she was sealed. However, as a teenager for her age, the Princess encounters everything that school has to offer. Oh yes… snippy popular mares… with all this, and her spell wearing off over time and re-gaining her magic to full level again, how can she cope with it? As well as keeping her identity a secret?