Set a few weeks after Luna has been brought back, two ponies from the bureaucracy bring a matter to Celestia concerning Luna's authority to rule. As it is a show good taste, Luna agrees to be tested.
A thousand years after Luna and a population of night-loving ponies moved to the moon, they're due to return to a day-loving Equestria, resulting in a clash of cultures and egos.
Princess Luna has got into an argument with her sister and goes to her private realm to vent. Meanwhile, in another realm, Prince Artemis has got into a similar situation. From what was a simple encounter between the two quickly becomes anything but
