Synopsis
Kirino Kousaka appears flawless: she is beautiful and achieves top academic results, while also working as a professional model alongside her best friend Ayase Aragaki, a girl who hates lies and otaku culture. But Ayase has no idea about the secret side that Kirino carefully hides. One day, Kirino's ordinary older brother Kyousuke stumbles upon an erotic game belonging to his seemingly perfect sister. To protect her reputation, Kirino forces Kyousuke to keep quiet and introduces him to the realms of anime and eroge. Through her, he encounters the gothic lolita Ruri Gokou and the bespectacled otaku Saori Makishima, drawing him into a new lifestyle. As Kyousuke becomes more involved in his sister's double life, keeping the secret grows ever harder.
Background
Ore no Imouto ga Konnani Kawaii Wake ga Nai also has a drama CD, a radio show and video games based on the franchise.