Most of them live in town sand cities in the narrow plains along the coasts. This makes Japan one of the most crowded countries in teh world. In Tokyo, some people work as people pushers. The people of Japan are almost all Japanese. There is little ethnic diversity. One exception is the Ainu. They are the native people of Japan. The Ainu once nearly disappeared, but today they are reviving their traditions. Most Ainu live on Hokkaido.