Princess Rouge

Japanese Title: プリンセス・ルージュ

Plot
Yūsuke is a young, orphaned, high school student who was late for class one day. While on his way to school, a girl falls from the sky and lands on his lap. Rouge, the mysterious girl who fell from the sky, suffers from amnesia and remembers nothing except her name. Yūsuke offers her a place to stay until she recovers her memory. After spending many days of playing, shopping, and eventually, falling in love, Yūsuke suddenly encounters two women, Kaige and Meige, who claims to be Rouge's royal sisters and has revealed that Rouge is the oldest daughter of the Underworld's royal family. Now, Rouge and Yūsuke are threatened with separation not only by Rouge's sisters who want to take her back home, but also by enemies of the royal family who wish to capture Rouge.