Aware of Tsukasa's murderous intent, Senku sends him away to the source of the revival 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 volcanic hot spring, giving Senku the means to create gunpowder.