Ep. 8: The Cursed Fruit!! Beware the Sour Mikan!!

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The magical girl, Mikan Hinatsuki, is called by Momo to assist her with Yuko's training. As Mikan makes plans to transfer to Yuko's school, it is revealed that she possesses a curse that causes misfortune on people around her whenever she gets flustered. Later, as Yuko begins training to use her Crisis Management form at will, she learns from Mikan that magical girls disappear if they use up all of their magic. (Source: Wikipedia)