Stone World — Kingdom of Science

A mysterious green light petrifies all of humanity simultaneously. Thousands of years later, teenage science prodigy Senku Ishigami breaks free from his stone shell and immediately begins applying scientific knowledge to rebuild civilization. He revives his best friend Taiju Oki, and together they start producing tools, medicine, and basic chemistry from raw natural materials. Their project is threatened when Tsukasa Shishio — an extraordinarily powerful fighter — is revived and takes a radically opposite stance: that humanity should be rebuilt selectively, excluding the corrupt adults of the old world. Senku and Tsukasa's ideological clash splits their alliance and launches the central conflict of the series.

On April 5, 5738 years after a blinding flash turns every human on Earth to stone, Senku Ishigami regains consciousness inside his petrified body. Unlike anyone else, Senku's mind has remained active throughout the millennia, counting seconds to preserve his sanity. The first thing he does upon breaking free is begin cataloguing materials. The Stone World is not just empty — it is raw. Millennia of human absence have allowed nature to reclaim everything, leaving an untouched chemical laboratory of plants, minerals, and atmospheric compounds. Senku's first priority is reviving Taiju Oki, his physically powerful best friend, because early civilization requires muscle as much as knowledge. Together they attempt to produce revival fluid — a nitric acid compound capable of dissolving the stone casing — using bat guano, cave minerals, and vine-extracted ethanol. The process requires dozens of failed iterations before yielding usable concentrations, establishing the manga's recurring motif: science is iterative, not miraculous. The decision to revive Tsukasa Shishio proves momentous. Tsukasa is physically the strongest human alive — a teenager who defeated professional fighters and predatory animals with bare hands before petrification. His combat ability makes him essential for survival in a world filled with predators. But Tsukasa rapidly formulates his own ideology: the old world was built on exploitation, corruption, and inequality. The petrification is an opportunity to restart humanity without those flaws. He begins smashing stone statues of adults, preventing their revival permanently. Senku's opposition to Tsukasa is not sentimental — it is procedural. Science requires accumulated knowledge, which requires preservation of existing people and records. Destroying anyone prevents the transmission of expertise across generations. Senku's Kingdom of Science is not just a philosophical stance but a practical necessity: civilization requires cooperative specialization, not selective elimination. When Tsukasa discovers Senku's opposition, he kills Senku — or tries to. Senku survives through the calcified remnant of stone around his neck, setting up his flight to find allies before Tsukasa builds an empire of his own. The arc's final movement takes Senku toward Ishigami Village, a primitive community descended from survivors who were never petrified. These people possess traditions and crafts passed down for generations — real accumulated knowledge in practical form. Senku's scientific literacy combined with the village's practical expertise creates the founding partnership of the Kingdom of Science. Chrome, a self-taught young inventor who independently discovered many basic chemistry principles, becomes Senku's intellectual partner. Kohaku, a warrior woman of exceptional physical ability, becomes the combat arm of the new civilization. The Kingdom of Science is not Senku alone but a collaborative enterprise where different human strengths combine toward shared progress.