Luna feels like she is the only one that takes being a princess seriously. Both her sister and niece seem to forget the grace a princess must have. Luna especially dislikes it when they poke fun of her for being, as they would put it, uptight.
Everypony in ponyville knows the adorable little filly, Sweetie Belle. Unfortunately for them, she is unavailable at the moment. Meet Leon, the new guy in town, and currently in possession of Sweetie Belle's body.