She is Kuzumi Taiga's older sister and is 19 years old. She is very short for her age and is often mistaken as the younger sister instead leading to a complex about her height. She was a rising star in karate during her grade school and middle school years, so much that Kumi admires and wants a match with her, though was told to fortify her body first. Due to Kokuha practicing on Taiga constantly, he became much tougher than most people would. She also had a one-time infatuation with Kenjiro Hiiragi, though upon mistaking her an elementary school girl she felt rejected and proceeded to beat Kenjiro severely.