Kyōshirō, the new transfer student from the legendary Jōtō Academy, is instantly a heartthrob to the ladies. He strongly resembles the prince from Kū's dreams. He supports the Central Student Government and has also stated his absolute intention to recover and destroy all of the Absolute Angels, following what he believes to be the wishes of his deceased brother, Kazuya. He eventually falls in love with Kū, which forces him to reevaluate his life goals and the way he has been treating Setsuna. Before he can settle matters with Setsuna, however, Kazuya returns and steals her and Kū away.

A refined gentleman, adept in playing the violin and horseback riding. Kyōshirō is the youngest of the four children in his family.