Yokohama Kaidashi Kikou

The story is set in future Japan, in which the sea level has risen and flooded many of the coastal areas and Mt. Fuji has erupted within living memory. The population has been considerably reduced and political and technological institutions have broken-down. Local communities have become nations and telephone and television no longer exist (although coffee vending machines and streetlights stubbornly continue to work). There are strange new animals and plants (like flying fish and glowing streetlight trees).