It is the third and final work in what is regarded as Osamu Tezuka's early science fiction trilogy, consisting of Lost World (1948), Metropolis (1949) and Nextworld (1951).

[3][4] Created in a time when the Cold War was becoming hotter, Nextworld is Osamu Tezuka's parody of the tense relationship between the USA (represented as the 'Nation of Stars') and USSR (known in the work as the 'Uran Federation').

The main storyline focuses on atomic tests that create a race of mutant animals known as Fumoon, with psychic powers and intelligence beyond humans, who formulate a plan to evacuate hundreds of animals and a small group of people off the planet Earth.

The reason for this is due to a large toxic cloud approaching the Earth, threatening to wipe out all life.

Fumoon (フウムーン) is a 1980 Japanese science fiction anime television film created for Nippon Television Network's annual 24-hour charity program, Ai wa Chikyū o Suku (愛は地球を救う, "Love Saves The Earth").