Koumura, Toshio

幸村俊夫

Toshio Koumura serves as a language instructor at Tomoya's school and acts as Tomoya's homeroom teacher during his first year. His current age masks a formerly vigorous past defined by his passion for teaching. He was friends with Kouko Ibuki three years prior.
Five years ago, he worked as a strict teacher at an engineering school, where he gained a reputation for dealing with delinquents. He successfully reformed many of those students for the better, but at Tomoya's school, his specific skills are unnecessary due to the institution's prestigious image. He perceives Tomoya and Youhei as oddities and resolves to improve them; he is the one who orchestrated their meeting.
He retires one year later, before the conclusion of the school segment of the story. In the After Story, he returns and organizes a fake graduation ceremony intended for Nagisa, which was arranged by Tomoya.