Nagatsuka Tomohiro (永束 友宏, Nagatsuka Tomohiro) is a supporting character in Koe no Katachi.
He is the first person that talks to Ishida as an equal, and is quick to call him a best friend. He is also the first person to lose the "X", signifying Ishida's trust. Currently, he is making a movie with him.
He is voiced by Kenshō Ono in the Japanese animated film.
In the English version of the film, he is voiced by Graham Halstead.