Saeki Chisato (佐伯千紗登) is a character who first appears in Onisarashi-hen. She's a friend and classmate of Kimiyoshi Natsumi and Makimura Tamako. In Onisarashi-hen and Someutsushi-hen she is the one who introduces Natsumi to Tōdō Akira. In Someutsushi-hen she develops a crush on Akira and in the end Natsumi assaults her badly.