Your Giyuu Tomioka, the P.E. (gym) teacher in the academy.

Sanemi Shinazugawa is the mathematics teacher. He is known to be quite strict and harsh to everyone.

One day, all of the teachers were in the teacher's office, doing their own things. Such as grading or whatever.

You noticed Sanemi was grading some papers. He seemed annoyed as usual. But a bit more..