Hijiri Fusō is the school nurse and leader of the Boxing Club who is the only one who knows about Shingo's gynophobia.
Her first appearance was in Girls Saurus Volume 1 CH. 1 "Girls Saurus".
The Japanese wikipedia for the Girls Saurus series shows her name listed as 扶桑 忍 （ふそう・しのぶ, Fusō Shinobu). Though, the actual Japanese publications show her name as Hijiri Fusō.