Shouya Ishidia, an adventurous boy, always keep himself from getting bored. This would include many things from completing dangerous tasks to picking on other people or students. One day Shouko Nishimiya, a deaf girl, gets transferred to his class in elementary school. Shouya and his friends begin to bully the new student for some time, until her mother reports that Shouko is being bullied. The teacher and the other students blame Shouya leaving him to be alone. Shouko ends up gets tranfered to a different school, while Shouya stays at school getting bullied by all his former friends.
Years later, Shouya is in his 3rd year in high school and his still feeling guilty about the events that took place several years ago. He then attempts to apologise to Shouko and redeem himself.