What is it?
The 2016 Japanese anime teen drama movie A Silent Voice (A Silent Voice: The Movie).
Here is how The IMDb describes this anime movie:
The story revolves around Shôko Nishimiya, a grade school student who has impaired hearing. She transfers into a new school, where she is bullied by her classmates, especially Shôya Ishida. It gets to the point where she transfers to another school and as a result, Shôya is ostracized and bullied himself, with no friends to speak to and no plans for the future. Years later, he epicly sets himself on a path to redemption.—Ariodito Koestoer