Arinko no Uta

Despite his parents' objections, Daisuke Shiro, a young teacher, took a job at a small school in the countryside. He was not welcomed by the villagers and their children, who saw him as an outsider. However, as Daisuke treated his students with compassion, they gradually come to understand each other. Daisuke and the students practiced hard for the big sports day competition between the local villages, and their bond is further strengthened.

At the same time, children of migrant workers, who have been neglected due to the absence of their parents, came to the village and caused trouble. Daisuke struggled to resolve the conflict between the children.

(Source: Mangapedia, translated)