Why it matters
It completes Tezuka's early SF trilogy and pushes the manga route from lost-world adventure and robot-city spectacle toward global crisis.
By the time Tezuka reaches Nextworld, early manga science fiction has stopped politely knocking on the laboratory door and started asking what happens when the whole planet becomes the experiment.
Nextworld follows Lost World and Metropolis as the third of Osamu Tezuka's early science-fiction trilogy. Its scale is part of its significance. Where Lost World draws on hidden-place adventure and Metropolis turns toward robots and city symbolism, Nextworld widens the lens to global danger, scientific anxiety and the feeling that modernity has become much too large to fit safely in one room.
That makes it valuable for the Brass Shadows era of this map. These works predate the formal coining of steampunk and do not belong to the steam-driven branch. Yet they show the international spread of scientific romance, pulp spectacle and technological unease. Tezuka is not wearing a Victorian waistcoat here. He is building manga SF from the materials of post-war imagination.
The global-crisis motif is especially important. Steampunk often looks backward to the nineteenth century and imagines technological divergence. Nextworld looks at science and power on a planetary scale. That moves it closer to atomic-age anxiety, ecological warning and the big public questions of mid-century SF. The machinery is no longer just a clever device. It is a civilisation-wide hazard.
Tezuka's style gives the material speed and accessibility. One reason these early works matter is that they helped make large speculative ideas legible to manga readers through visual storytelling, character movement and serial energy. The result may feel broad by later standards, but broad is not the same as empty. Sometimes an early machine is all levers because nobody has yet invented the tasteful control panel.
The trilogy progression is also useful. Lost World begins with the old adventure thrill of hidden places. Metropolis turns toward robots and the city. Nextworld moves outward again into a larger, more anxious planetary field. That sequence tells us something about how quickly post-war manga SF was learning to scale up its concerns.
For readers tracing steampunk's international neighbours, this matters more than any single gadget. The book shows manga adapting scientific-romance ingredients to new historical pressures. Adventure remains, but the mood is less innocent. The future is exciting because it is dangerous, and dangerous because adults keep confusing cleverness with wisdom.
It also completes the trilogy's useful arc from hidden place to modern city to endangered world. That makes it more than a footnote for completists.
For steampunk-adjacent readers, the interest lies in lineage. Nextworld helps show how manga took up ideas about science, catastrophe and speculative society while European and American traditions were following their own routes through Wells, Verne, pulp, comics and cinema. The family resemblance is real, even when the surname changes.
Is it really steampunk?
No. Nextworld is early manga science fiction, proto-retrofuturist rather than steampunk. It belongs near the field because of its scientific spectacle, crisis thinking and place in Tezuka's formative SF trilogy.
Its best use is contextual. It shows that the wider field of retro-scientific imagination is international, messy and older than the current labels. Anyone mapping steampunk's neighbours needs these early manga works because they explain where later Japanese machine fantasies found some of their deep roots.
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