Yoshimura

Yoshimura (吉村) is a teacher at Kaimei High School who teaches Japanese History and is responsible for Class 2-E's homeroom. He is the faculty adviser for the broadcasting club. At one point, he made a DVD containing upcoming math exam questions and blackmailed Kaoru Yagi with it when her DVD and his were accidentally swapped.

Manga Debut: Chapter 15 (You Mustn't Watch It)
Anime Debut: Episode 10 (You Mustn't Watch It)

(Source: Sketdance Wikia)