Fushigiboshi no☆Futagohime
Japanese title: ふしぎ星の☆ふたご姫
Alternative titles: Fushigi-boshi no Futago-hime, Fushigi Boshi no Futago Hime, Twin Princesses of the Wonder Planet, Twin Princesses of the Mysterious Star, Twin Princess of the Mysterious Planet
Type: TV
Source: Original
Episodes: 51
Status: Finished Airing
Aired: Apr 2, 2005 to Mar 25, 2006
Broadcast: Saturdays at 10:00 (JST)
Duration: 24 min per ep
Rating: G - All Ages
Studios: HAL Film Maker
Producers: TV Tokyo, Nihon Ad Systems, Omnibus Promotion
Genres: Comedy, Fantasy
Themes: Mahou Shoujo

In the hollow Mysterious Planet, seven kingdoms co-exist, all of them lit by the Sun's Blessing from the Kingdom of the Sun, in the middle of the planet. The light of the core sun is necessary for the continued existence of all the kingdoms. Yet, something is causing the Sun's Blessing to weaken. If something isn't done, it will be the end of life in the Mysterious Planet. Fortunately, the twin princesses of the Sun Kingdom, Fine and Rein, have been endowed with the magic of the Prominence, and are looking for a way to fix things. 

(Source: ANN)