Ore no Imouto ga Konna ni Kawaii Wake ga Nai
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Kyousuke thinks of himself as a pretty normal high school kid, but his little middle-school-aged sister Kirino is something else. She's the coolest of the cool little girls at her school, and the prettiest of the pretty. It's no surprise that she's contemptuous of her older brother, and she hardly ever even speaks to him.
But one day, he finds a hidden adult anime video game in the house. At first terrified that people will think it's his, it slowly dawns on him that this is his perfect little sister's property! Now he's in on his little sister's secret, which is that she models for magazines to get money to feed her erotic anime "little sister"-themed game addiction. Will he be able to get over the cognitive dissonance and help his little sister keep her obsession a secret?