Magister Negi Magi - Mahō Sensei Negima!!

Yakimoki Koigataki!? (1x18)

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Outside the academy, Chizuru and Natsumi discover that the building is surrounded by an invisible, impenetrable barrier. As Chizuru and Natsumi run back inside, they vanish. Negi senses that this has happened, but cannot recall who he is thinking about.