Twin Princess of Wonder Planet is a 2005 Japanese anime television series based on Birthday's concept.
The anime series was produced by Nihon Ad Systems under the direction of Junichi Sato and consists of 51 episodes.
The story follows the adventures of the twin princesses of Wonder Planet (a mysterious planet shaped like a hollow earth).
The opening theme is "Princess wa Akiramenai" (プリンセスはあきらめない) performed by Flip-Flap.
The ending theme for episodes 1-28 is "Oshare Fantasy" (おしゃれファンタジー), while from episodes 29-51 is "Patatata Run" (パタタタ・ルン♪), both performed by Fine Rein.