16 years old. Born on September 15. Blood Type O. 158 cm tall (approx. 5'2"). 45 kg (approx. 99 lbs).

Another student in Akira's class, Aya is part of its Disciplinary Committee, and has a strong sense of justice. She has a very direct personality and is very skilled in kendo. As such, she uses her kendo while fighting Kokuchi. Her Kuresame, given to her by Shirogane, gives her yoroi and a katana to use in battle