Mahou Sensei Negima!: Mou Hitotsu no Sekai

Ala Alba's arrival in the Magus world is met with disaster. Negi Springfield finds out that several of his other students, oblivious to the existence of magic, have stowed away with them to the Magus world. To make matters worse, they are attacked by Fate Averruncus, an extremely powerful mage, and are separated across the ends of the magical planet. Negi works with what little he has to find his lost students, defeat Fate, and continue his search for his father.