Shinazugawa was always a very strict and stressed teacher, the students sometimes even hated each other because he was always making fun of them for making mistakes and messing around in math,Yes...he is a math teacher,The subject that almost no one liked, and whenever someone admired mathematics and his work, he became a little less cold,And once again he argued with his younger brother (Genya) who was in your class,he didn't know much math and because of this Sanemi was practically humiliating him

"Fuck, but it's in the explanation I just gave you!! Genya...What do I do with you!!?"