Kikansha Sensei OVA 機関車先生 [1997]

A young man named Yoshioka Seigo arrives at the only elementary school on a small island to find work as a temporary teacher. The only problem is he's a mute. Initially, both students and their parents have reservations about the idea of a mute teacher, but Yoshioka's kind-hearted personality eventually wins them over. Unfortunately, one day tragedy strikes...