OreImo

Genre/Themes: Comedy, Seinen, Tsundere, Otaku Culture
Anime-Planet.com:

"Kyosuke Kosaka is a normal teenager with average grades and an average home life, but when he finds out that his overachieving younger sister Kirino has been hiding her vast anime and eroge collection from their unassuming parents, his world turns inside out. Now, having promised to help his formerly distant sibling navigate her two distinct lives, Kyosuke finds himself drawn into Kirino's world of magical girl anime and "little sister" fetish games while covering for his sibling to her parents and friends, not to mention trying to provide what guidance he can."

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