Arinko's Song

(from ebookjapan):

Daisuke Shiro has been transferred from Tokyo to a rural mining town as a teacher. The one who was teaching the children in a haunted house-like temple/kindergarten was a extremely violent man named Okuyama. He refuses to recognize Daisuke as an urbanite. One day, however, there is an accident in the coal mine that results in a fatal fall, and Okuyama is injured. Daisuke takes care of the children instead. The first thing he does is to organize an inter-town athletic meet! However, just before the event, one of the students, Gonsuke, disappears. ......