Ultra Maniac (OVA)

Ultra Maniac was released in 2003 as an anime but was originally a manga written by Wataru Yoshizumi. It follows the two main characters, Ayu Tateishi, the best tennis player in the girls tennis club. And Nina Sakura, a young witch exiled to the regular world to learn more about how to control her powers. It's a romantic comedy with an overarching storyline, following Nina and Ayu going through misadventures and figuring out their love life while Nina collects the five holy stones in hopes of improving her magic and returning to the magical kingdom.