There was a thread about it earlier today.
I only read it briefly, but basically she's entering this huge arcade game competition. Now, noramlly she's just some normal kid, or maybe even above average. HOWEVER! When she flashes her panties (or rather, when someone flips her skirt and everyone can see her panties), her godtechnique FASHION PANTIES is activated. She then proceeds to play the arcade upside down. As in, she's fucking standing on her hands while playing.
Later in the series, there's some rival who does the exact same thing, although her clothes are black and she's probably evil in some way.