Aria Holmes Kanzaki (神崎・H・アリア Kanzaki H Aria) a.k.a. Sherlock Holmes the 4th, is a female transfer student of Butei High school and the female protagonist of Hidan no Aria. An "Assault" department elite rank S (The highest rank) Butei, she wishes to recruit Kinji as a partner 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 M1911 pistol (also known as Colt Government) for guns, and two undersized Japanese swords known as "Kodachi". Her main goal is to defeat the IU and exonerate her mother.