Fushigiboshi no Futagohime

Fushigiboshi no Futagohime (ふしぎ星の☆ふたご姫, lit. "Twin Princesses of the Wonder Planet") is a 2005 Japanese animated television show directed by Shōgo Kawamoto and with Jun'ichi Satō as chief director and character designs by Birthday. Following Birthday's original concept in 2003, it was taken by Nihon Ad Systems and TV Tokyo and was reproduced into a full-length series in 2005. A sequel titled Fushigiboshi no Futagohime Gyu! premiered in 2006 and aired until 2007.

Plot
Seven royal families reign over each of the seven kingdoms, prospering inside the planet for many years. Ohisama no Megumi (the sun's blessing) is beginning to die, and it has been forecasted that it will disappear in one year. If it disappears, all of the planet will be covered in darkness. Twin princesses Fine and Rein receive a secret mission from Princess Grace to investigate the reason for the star's decline. Using the power of the Prominence, they hope to rescue the Ohisama no Megumi. An evil chancellor from the moon kingdom named Roman steals the Prominence for his own purposes. After he unleashes the ultimate enemy, evil begins to spread.

Official

 * http://futagohime.jp/fushigi/menu.html
 * http://www.tv-tokyo.co.jp/anime/futagohime/
 * http://futagohime.jp/