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Senku has the idea of creating gunpowder to have a way to balance the scale and have a chance to defeat Shishio. The production of gunpowder causes a fire. Shortly thereafter, Senku and the others discover smoke signals on the horizon. An accident? Hardly likely. Apparently there are other people in the stone world ...
Episodes
1Stone World 2King of the Stone World 3Weapons of Science 4Fire the Smoke Signal 5Stone World The Beginning 6Two Nations of the Stone World 7Where Two Million Years Have Gone 8Stone Road 9Let There Be the Light of Science 10A Flimsy Alliance 11Clear World 12Buddies Back to Back 13Masked Warrior 14Master of Flame 15The Culmination of Two Million Years 16A Tale for the Ages 17A Hundred Nights and a Thousand Skies 18Stone Wars 19To Modernity 20The Age of Energy 21Spartan Crafts Club 22The Treasure 23Wave of Science 24Voices Over Infinite Distance