Discord was defeated, and thanks to the two princesses Equestria's wealth and prosperity is on the rise, but one of the two sisters isn't feeling all that happy. Princess Luna, sister to Celestia and ruler of the night, is angry and frustrated that none of her subjects appreciate her work or her night. Each night she sits in her throne room alone, her anger rising more and more each time. One night she ends the court session early and heads to the castle gardens to calm down, and finds something that will change her life forever.