This article analyzes how Japanese schools multiplied in Manchukuo and China in the 1930’s after Japanese military occupation. It is important to note that these schools were authorized by the Japanese government as equal to those of mainland Japan and its colonies. This means that these schools were connected to the network of the Empire of Japan and expanded it. This network was especially stabilized by the establishment of junior high schools. Furthermore, Japanese elementary schools were even founded in undeveloped land in Manchukuo. However, the schools located in these areas tended to be isolated due to the lack of support by the Japanese government. On the other hand, in addition to Japanese people, Korean people joined this network as “Japanese subjects”. Some Japanese schools had more Korean students than Japanese ones. Hence, Japanese assimilation was enabled. For Japanese people, the area was, as it were, the frontier.