Episodes

Senku and Taiju prepare enough revival fluid to free one person from stone, with Taiju choosing Yuzuriha to be first subject. However, they are suddenly chased by hungry lions, leading them to instead revive the strongest fighter in their school, Tsukasa Shishio, to fight them off. Tsukasa killed the male lion and skins it to add to his attire. As Tsukasa proves to be a valuable hunter, providing food for the trio, Senku assigns Taiju with harvesting seashells and grind them into calcium carbonate as a first step towards advancing civilization. However, Tsukasa reveals to Senku his intention to murder petrified humans to create a world free of corrupt adults, clashing with Senku's ideals of reviving everyone. (Source: Wikipedia)

Aware of Tsukasa's murderous intent, Senku sends him away to the source of the miracle fluid while he and Taiju make a batch of revival fluid to finally revive Yuzuriha. Needing weapons of science to stop Tsukasa's murder spree, Senku and the others begin travelling towards Hakone, with Yuzuriha managing to find the Great Buddha of Kamakura to serve as a landmark. The trio eventually arrive at a hot spring, giving Senku the means to create gunpowder. (Source: Wikipedia)

After Senku creates a successful batch of gunpowder, which Taiju accidentally sets alight, the group spot a different source of smoke in the distance, suggesting that there are other survivors. Senku makes the decision to light the first further to use as a smoke signal, leading Tsukasa to find him and use Yuzuriha as a hostage to obtain the recipe for the revival fluid. As Senku relinquishes the recipe to save Yuzuriha and is given the choice of either abandoning science or dying, he recalls how he developed his love of science and became friends with Taiju. Refusing to abandon science, Senku prepares to die at Tsukasa's hands. (Source: Wikipedia)

With Senku seemingly killed after Tsukasa delivers a fatal blow to his neck, Taiju and Yuzuriha use his gunpowder to set off an explosion around Tsukasa, allowing them to escape. Realizing that Senku wouldn't simply sacrifice himself, Taiju and Yuzuriha discover some petrification on his neck, giving them the opportunity to heal the injury by using the revival fluid. Meanwhile, a flashback shows how Senku first emerged from his petrification and developed the tools needed to survive. (Source: Wikipedia)