Hisako Kajiura

Hisako Kajiura (梶浦 緋紗子 Kajiura Hisako) is Mizuho's 3-A homeroom teacher and one of the few people in the entire school, other than Mariya, the headmistress, the deputy head teacher (video game version) and later Shion and Ichiko, who knows that Mizuho is in fact a boy. She has a helpful personality and told Mizuho to come to her if anything was bothering him. She often gives out candy to her students.

In the video game version, she was previously a student of Seio Girls' Academy, but she had to transfer to another school because of her father's job. She returned to become a sister and a teacher at the school because of Shiori's death after she transferred. She later resigned from her post to become a novelist and wrote a novel about her memories of Shiori under the pen name Hisa Kamimura. She has returned to the school at principal Sawe's request and is acting as both Chihaya's homeroom teacher and the acting principal of the school while Sawe is undergoing medical treatment.