Mathematics teacher

The mathematics teacher teaches Class 2-A at Sanada North High.

Appearance
The mathematics teacher is a somewhat tall individual with black hair parted either side of the centre. He is seen wearing formal attire, with a dark tie and his coat matching his pants.

Personality
He seems to be rather absent-minded, having used the wrong book to teach his class for days on end.

High School Boys and Studies
As the classes go on, an increasing number of students in 2-A start finding it difficult to keep up with the mathematics classes. This prompts the main trio, Mitsuo and Motoharu to form a study group one day just so they can catch up. The next day, as the class begins, some of them are still not entirely confident.

The mathematics teacher walks in and prepares to start. As he notes down a few things on the board, he suddenly realizes something and checks the text book. He turns around and announces that he'd been accidentally using the book meant for third-years. The students collapse in shock.