Ultra Maniac is a short 20 minutes OVA coupled with Full Moon o Sagashite short 10 minutes OVA which went on sale with Ribon Magazine. The story is based on manga by Yoshizumi Wataru, and generally revolves around school kids with comedy and light-hearted romance theme for shoujo readers. Here is the description from the manga:
Ayu is one of the coolest students at her school. She is smart, studious, sporty and has just the right ammount of untouchable quality to make her a friend of everybody. Her male counterpart is Kaji-kun: warm, happy, friendly and a memeber of the baseball club. No wonder Ayu's got a crush on him!
One day, Ayu sees a new student, Nina, crying and looking for something. After Ayu helps her find it, Nina decides to show her gratitude in the best way she knows, magic! Nina turns out to be a student from the Magic Kingdom and is currently "studing aboard" in Ayu's school!