Her big brother's honor, her own self-worth, and validation of her relationship with Touga (Anime)
Touga's little sister, the prototypical "queen bee" of the school. She is very fond of him to the point of their relationship having semi-incestuous edge, at least on her part. Nanami often makes various malicious attacks on students she deems inferior (or worse, those she suspects Touga is paying attention to). Nanami is not a main character in the manga and is only seen once in a picture with Touga. She is seen only once in the movie, in a reference to an episode in which she was transformed into a cow. (Source: Wikipedia)
