This anime features a high school guy named Kousaka Kyousuke and his popular, pretty, intelligent and involved little sister, Kirino. They pretty much ignore each other and don’t get along very well, until Kyousuke finds out accidentally that his little sister is addicted to little sister porn games, therefore making her an otaku. Kirino then decides to share her secret with her brother, so that they can both make sure no one finds out about it. The little sister then makes her brother try the games out so that he can see what kind of game it is, and see if it really is a weird thing to have or not.
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