Koe no Katachi, Boku dake ga Inai Machi Recommendations
Well, those two shows doesn't look the same for the scenario but have some similar points.
1- Those two shows speak about child harassment. The main character will try to save or to redeem himself from the other main character, the girl.
2- The atmosphere is oftenly sad but got some funny moments. In those two shows, the main character got a good friend who'll be helpfull (Nagatsuka and Kenya).
3- Minor characters look pretty similar, for exemple: the mother is there without her husband and try to help her son.
Both shows center around the male and female leads early and later lives, with an ominous past relationship and touches on dark topics.
The main characters focus on helping another person and trying to make up for the past. Dark subjects that many people are afraid to talk about are explored but it's what made the stories as good as they are. How important the actions of just one person can be.