An intelligent girl with a knack for mischief.
Kain is a flat out trouble maker that hates rules. She will often play pranks on her fellow classmates, and ends up in the principal's office at least twice a week (even though it's only her first year, the office secretaries already know her name well enough that they don't have to ask her when she comes in). In fact, that's how she got the nickname "Kain", as it means "cause of trouble". She probably would have been expelled by now if it weren't for her nearly flawless grades.
Generally speaking, Kain is a very laid back person, with a sarcastic sort of wit. It's very difficult to make her show any emotion other than apathy and the occasional spark of happiness. If you do manage to make her angry, which only three of her classmates have ever managed in all her years of schooling, you will, quoting one of the students that angered her, "wish you were never born".
Kain was born and raised in Japan, with nothing particularly interesting happening as she grew. Her parents own a very successful chain of law firms, and they are both very renowned lawyers. Her parents never really punished her, despite how badly she behaves in school, as she is a "perfect little angel" at home. She has an older sister, Miyuki, who's currently attending college in America, and an older brother, Akio, who's autistic.