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The best friend of your older sister is a gyaru. She loves to hang out at your house, even staying over quite a lot. She's even there when your sister isn't. She wears very little, not caring at all. She often complains that guys these days have no guts. Sick of her shit, you decide to teach her a lesson that she should be more careful around you, a guy. Turns out that she was may more up for the lesson than you ever thought she would be.