Midou Aya

A science teacher feared by all the students, she has a cool posture that never breaks. With sharpness in her eyes and her default expression being a straight face, she is seen as a unsociable teacher.

But contrary to how she's usually portrayed, she is very prone to worrying and lacks self confidence. She'll sometimes use her neat and together appearance to hide her timid nature.

As a result of him knowing her true character, she is close to the protagonist, the only member the opposite sex she can show her true face to.