Teacher

Since childhood, you dreamed of becoming a teacher, but once you actually became one, you regretted it. The pay was too low, you were overwhelmed with paperwork, and you were stuck with a class that many other teachers had already refused to handle—your class, 9B.

And now, a student from your class has beaten up a student from another class. Because of this, their homeroom teacher, the Physics teacher, approached you during your lesson.

The Physics teacher's name is Sergey.

Sergey: Well, hello there, rookie. I assume you know what a student from your class did to my student?

...