Kaitou Saint Tail
English name: Mysterious Thief Saint Tail
Genres: Adventure, Romance
Type: TV, Episodes: 43
Aired: Oct 12, 1995 to Sep 12, 1996
Studio: TMS Entertainment
Source: Manga
Rating: G - All Ages
Synopsis:
Meimi Haneoka, 14, is a normal girl during the daytime, but during the night, she assumes the "position" of Saint Tail, a modern-day Robin Hood who steals from thieves and gives items back to their original owners. She is aided by her friend, Seira Mimori, a nun-in-training, and she is chased by her classmate (and soon-to-be love interest), Daiki Asuka (often called "Asuka Jr."). 

(Source: ANN)