Negima!? Magister Negi Magi

Professor Negi, It Appears This is the Climax. Let's All Go Home Together, Negi! (1x24)

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Negi becomes trapped in a magical dimension where the controlled star crystal thief tries to destroy him, but with the assistance of all of his students, he is finally able to stop the thief and allow everyone to escape from the magical wasteland.