Kyōko Aono

Kyōko Aono is Tsukune Aono's cousin and one of the only humans (along with Tsukune before his transformation to a Ghoul) who knows of Yōkai being a monster school. He would refer to her as "Kyō" and she would refer to him as "Tsuki". Described as a tomboy with a stubborn streak, she is defensive of Tsukune, as she is like an older sister to him, and makes her appearance on the second day of the school festival while searching for Yōkai Academy. Tsukune and his friends attempt to keep her from finding out about the academy's nature and its students, as well as prevent the authorities from disco...