A teaching film for social studies, which was developed as a new educational subject in 1947. At an elementary school in Hokkaido, children have started a fly extermination campaign to improve school hygiene. In order to eliminate the causes of flies, the entire town is working to improve the sanitary environment. The short was filmed with the cooperation of Mizukaido Elementary School in Joso City and is the first film in the "Social Studies Teaching Film System" by Iwanami Film Productions.