Hitomi's elegant and fashionable older sister, Rui is the leader of the “Cat's Eye” group and the one who usually outlines and plans the heists. With model good looks, worldly sophistication, and a razor sharp intelligence she is able to handle almost any situation. She is extremely athletic and proficient in a great number of activities and skills including car racing, hang gliding, parachuting, helicopter piloting, motorcycle riding, roller skating, skateboarding, martial arts, electronics, handguns and scuba diving. She is a skilled actress and is able to disguise her appearance effortlessly. She is also fluent in a number of languages including English, French and German.
Rui acts as the mother figure for her sisters and is very protective of them. She is the only sister who has any lasting memory of their parents.