Equestria has a king, a queen, and a princess. Her name is Celestia, though not even she really knows the name of her mother and father, but that's besides the point. Princess Celestia has always wanted a sister, someone she could teach with her very advanced knowledge. Upon her request, a foal is born. Her name is Luna, after the Spanish name for 'moon'. With this being true, will Celestia's knowledge be enough to help her sister? Or will she have to find out how to raise the moon?