Dr. STONE S01 E04 Fire the Smoke Signal

"This is exhilarating... get excited!"

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 ...