Locomotive Teacher (2004)

Seigo Yoshioka (Kenji Sakaguchi) is a teacher that became mute after a kendo accident. He feels lost after the accident and eventually decides to teach again on a small island where his mother was born. The children there on the island quickly name him "Kikansha Sensei" (Teacher Locomotive) after learning he is mute. The parents on the island are mostly hostile to Seigo Yoshioka, believing he is incapable of teaching their children. But with Seigo Yoshioka's determination and kindness, a strong bond develops between the students and the mute teacher, which then changes the parents' opinions of Seigo Yoshioka. Suddenly, tragedy then strikes ...

Unfortunately the movie Locomotive Teacher is not yet available on HBO Max.