Up to you really.
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For culture festival, the two Ichika play Hansel and Gretel. Because Cinderella/Snow White play result in everyone want to be the main heroine. As the result, they made a short film instead. (in the vein of
2013 Hansel and Gretel: Witch Hunter, and involvement of I.S. meant more stuff to blow -it's 3D simulator but still-, cue hilarity)
But of course, then wincest vibe kick the high gear. This is, of course, lampshaded awesomely by the Father (played by Dan) after he kicked many, MANY ass included his own badass child-abusing wife and many other witches, just so that he could find the twins.