Nakajou Shigure

A female teacher in charge of student guidance, and Hibiki's homeroom teacher.
She was Sister Madoka's senior in college.

She likes to dress like a man and is a cool beauty who rarely shows her emotions, and her androgynous charm makes her secretly popular with the girls.

She is kind to the girls, but very strict with the boys, which makes some of them feel annoyed by her.

This seems to be related to her sexual preferences...