Nakaimo – My Sister Is Among Them!

(Kono Naka ni Hitori, Imouto ga Iru!) (Promotional Video) Airing from July 6, 2012

A light novel adaptation, about a boy who has to find a girlfriend at school if he wants to inherit the family business. Complications arise when it turns out that his long-lost sister also attends his school, and he doesn't know what she looks like.