Sweetest Smiles ☆ Twin Princesses is the first episode of the Fushigiboshi no Futagohime anime series.
Princesses Fine and Rein are the princesses of The Sunny Kingdom. A Best Princess Ball is held within the kingdom and princesses from all seven countries come. The twins meet Princess Grace, the princess who died saving the seven countries from darkness. They also learn how to use the Prominence. Prince Bright of the Jewelry Kingdom is also introduced, along with The Flame Princess, Lione.