You should watch Ultra Maniac!

This fantasy and romantic comedy consists of 26 episodes.

"Tennis star Ayu Tateishi is the junior high school's "queen of cool," and she has her eye on Tetsushi Kaji, the star of the baseball team. All is well with her world, until she unwittingly helps out novice witch Nina Sakura, who then feels compelled to do her magical favors whenever she can. Nina has a "portable magic PC" with which she can download spells (and some cool MP3s) from the Internet. What she doesn't have is much experience with witchcraft—so her attempts to help Ayu result in predictably wacky hijinks." [Source: Amazon]