Kokoro Amatsu is the Aoba High School's Girls Volleyball team Coach and the adviser of Kaizaki's class.
Kokoro Amatsu has brown hair and a set of brown eyes.
She appears to be an energetic, caring teacher and keeps all her students under control, even though she is one of the youngest teachers at the school. She gives advice to her students and is quite mature.
Koushi Usa - her fellow colleague in Aoba High School.
Sumire Inukai - fellow colleague.