What is the relationship between the father and the teacher in the Queen's classroom?

Akujin Makoto, the new head teacher, is constantly exerting her demonic "nature", treating students differently according to their grades, not letting them go to the toilet, letting seniors pee in class, and forbidding students to eat. Even tell them prematurely that the real society is cold, which is simply the public enemy of students.

As a result, Kanda and Miyuki, who became vice principals and vice principals because of their worst grades, finally rose up after being abused by embattled troops. Because of their unremitting efforts and promotion, other students began to unite against the strict array.

However, Xin used to be a gentle teacher, always smiling, like to wear light clothes and have wavy hair. It's just that she was forced to go to a teacher re-education school for two years because she hurt students. These two years seem to have a great influence on Shinya. She is not the same as before.

With the confrontation with the real vector and self-growth in the process, students realize what they have learned from the real vector. And Akujin Makoto, is he a devil teacher or an angel?