A sprawling and ambitious work by Osamu Tezuka. It's jam-packed from many of Tezuka's characters from his star-system. Notarin, Mitchy, Lamp, Hanamaru, as well as Kenichi, Ban, and Rock are all here. Unfortunately, it's one of his lesser-known manga. It switches from one character's perspective to another, with chapters usually being less than ten pages long. It can get quite confusing, especially if you aren't familiar with the characters. This is because the manga was less than a third of the length that Tezuka initially wanted it to be. However, it does give the story a sense of grand scale. Other Tezuka manga I've readhave felt like they were on a more limited scale than this one. And it makes Nextworld feel like something special.

The story itself is the type of soft science fiction which Tezuka excelled at. At the center of the plotline is a psychically and telepathically gifted species also native to earth which suddenly emerge, and their plans for earth and humanity. The story also involves the shortcomings of humanity, and our tendencies towards pointless conflict and violence. There is a parallel to the Cold War in the conflict between the American-like nation of Star and the Russian-like nation of Uran.

Overall, I recommend reading it only if you've read a few Tezuka manga already and are familiar with his Star System. Otherwise it may be too hard to follow and enjoy properly.