A gym teacher at the girls' school. In the girls' first year of high school, she is the homeroom teacher of Class 5. During their last two years, she is the homeroom teacher of Class 2. An old high school friend and rival of Yukari, they have a juvenile, exasperating, but funny relationship with each other; Yukari relentlessly insults and freeloads from Nyamo, but Nyamo gets her digs in, too. "Nyamo" is a nickname from her student days, but Yukari calls her that, and so does Tomo. Other students call her Kurosawa-sensei. Whereas Yukari appears to be an older version of Tomo, Nyamo resembles Yomi (more in personality than looks) and the two teachers' odd relationship is similar to the one that Tomo and Yomi share.
Popular with the students, Nyamo is nicer, less obnoxious, and far more in control than Yukari. Yukari often teases her about her past romantic relationships and that she is a "stupid P.E. teacher". During one of the summer trips the girls take together, Nyamo gets very drunk (usually, Yukari is prone to this behaviour; as a matter of fact, Nyamo drank specifically to keep the alcohol away from Yukari) and tells the girls all about the birds and the bees, which embarrasses Sakaki and confuses Chiyo, but impresses the other girls.