A young Celestia is tired of her life as a wanderer and longs for all the luxuries of home. Her best friend Discord is unable to see anything but the best of her.
When Discord is reformed by Fluttershy, he returns to Canterlot along with Celestia to review his marefriend. Discord realizes that although Luna is happy to see him again, she is sad about what she did in the past.
Personally, Celestia has had few surprises — oh, there were a few: the unexpected return of her dear sister, Discord, the Crystal Empire's, and Tirek's escape. But most things, she finds, are nice and calculated... until now.
Following just after the events of "Make New Friends But Keep Discord" Princess Luna tries to join in the fun but ends up heading back to her room to resume her duties of the night. That is until Discord appears and offers her for a dance.
She had had the dreams before, but this one was different. It was a warning, telling Celestia to do one this she wishes she would never have to do. Dig up the old memories.
Celestia realizes that Luna is very sad after Discord's petrification. Celestia, concerned for her sister, she is determined to discover the reason for Luna's sadness.
Princess Celestia has a quiet dinner with an old friend. They enjoy a simple conversation that has nothing to do with the impending doom that could befall both of them in the years to come. Except, it absolutely does.