Wagnaria!!

Why!? The Night Before the Climactic Battle: Taneshima's Returned Favor (1x12)

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Pupura finds out about Takanashis tall sisters and is upset with him for keeping these ideal women from her. As punishment she sets him up to go on a date with Mahiru. An experiment to see how much more man acclimated Mahiru has become concludes that if she can't punch Takanashi she'll kick him in the nuts.