"So if I use this phrase jokingly..."
It sounds like you’d like a on something called “Uchi wa no Utouto.” I’m not sure what you’re referring to—there are a few possibilities (for example, a song, a manga, an anime, a cultural term, etc.)—and I want to make sure I give you the most accurate and useful information.
: A mischievous, dark-skinned girl with blonde hair and a "teasy" personality. : A black-haired friend of Chiaki. The Movie Database Distinction from Similarly Titled Series
This title belongs to a specific piece of adult anime (hentai) media, not an academic or scientific subject.
