Big Brother is a Prince! is the 11th episode of the anime series. Kirimi Nekozawa, younger sister of Umehito Nekozawa, comes searching for her big brother at Ouran Academy and stumbles onto the Host Club, where she mistakes Tamaki for her "handsome princely" brother. The Host Club strives to reconcile Kirimi (who is nyctophobic) with Umehito (who is photophobic) and with some hard-core training from Renge, the siblings are able to confront their fears and share a relationship.