Ryou Shiranui, a bright handsome popular guy, his Butei level is A. Even though there are different aspects involved in an A ranking, his integration capacity is high. Barehanded, dagger handling or shooting aspects can all be relied on. The reliability of his gun is very high, a Mk.23 MOD.0 with an installed laser aiming lens. He is also a rare polite person in Butei High. Even though he is very popular with girls, he never had a girlfriend before.
He is Kinji's friend and Mutou's too. In the past when Kinji was in Assault, he was often his teammate. Kinji considers him a good friend and someone to rely on, an example of a polite and elegant student.