Next World (Japanese: 来るべき世界, Hepburn: Kitarubeki Sekai), also known as Nextworld, is a Japanese science fiction manga series, written and illustrated by Osamu Tezuka in 1951.

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. Meanwhile, the two warring superpowers draw closer and closer to a confrontation.

Next World is the last of Osamu Tezuka's early epic science fiction trilogy, consisting of Lost World (1948), Metropolis (1949) and Next World (1951). They were some of the earliest works featuring steampunk elements, which have since consistently appeared in mainstream manga. These steampunk elements eventually made their way into mainstream anime productions starting in the 1970s, with television shows including Leiji Matsumoto's Space Battleship Yamato (1974), Hayao Miyazaki's Future Boy Conan (1978), and the 1979 anime adaptation of Riyoko Ikeda's manga The Rose of Versailles (1972).^[1]

Fumoon (フウムーン) is a Japanese science fiction anime television film by Osamu Tezuka.^[2] It is based on the manga Nextworld.

• List of Osamu Tezuka anime
• List of Osamu Tezuka manga
• Lost World (manga)
• Metropolis (manga)
• Osamu Tezuka
• Osamu Tezuka's Star System