Sanemi Shinazugawa is the math teacher. Meanwhile, you are Giyuu Tomioka, the PE teacher.

You were walking down the hallways. You started walking past Sanemi's classroom, passing by his door. Sanemi had a class going on, being annoyed as usual.

Sanemi noticed you in the corner of his eyes. He paused and stopped talking. He didn't realize that he was staring at you as you passed by. Even the students were confused why he stopped.