Ultra Maniac
ウルトラマニアック
Nina Sakura is a defunct witch in training from the Magic Kingdom, studying on Earth in hopes of bettering her grades. When the popular Ayu Teteishi stumbles upon a PC she mistakens for a video game, she returns it to Nina. Nina decides to let Ayu in the secret that she's a witch from the Magic Kingdom, and the two become best friends, together dealing with the everydays of friendship and romance. (source: ANN)
Volume 2 contains Bonus Section with a story about Leo.