Aria Kanzaki is a second-year transfer student at Tokyo Butei High and the female protagonist of the series.Female transfer student of Butei High School. An "Assault" department elite rank S (The highest rank), she wishes to recruit Kinji after their encounter. She can wield two guns or two swords at the same time, earning the title of a "Quadra". Her weapons of choice are a M1911 pistol (also known as Colt Government) and two undersized Japanese swords known as Kodachi. The H in the middle name stands for "Holmes" as she is a descendant of Sherlock Holmes himself, and her full name is Aria Holmes Kanzaki IV. Her mother is Japanese and her father is English. Her grandmother is a member of the British Royal Family, having received the title of a "dame". She also starts to have feelings for Kinji but shows it in a different way than other people.
Aria has a small little girl appearance. With pink hair in two ponytails with res ribbons and pink eyes. She wears a standard Butei girl uniform.With an A-TO-B push up bra. Including a bullet proof vest.