Ginro teases Kinro for not having a gold spear while rejoicing over his new silver spear. Senku appoints Ginro the group’s bodyguard while they go out to search for sulfur ingredients for the antibiotic.
“Buddies Back to Back”
The spear is also used for a sensor and turns black when the group needs to run away or they will die. Sulfer ingredients are dangerous.
Chrome, Kohaku, Senku, and Ginro make it to an area where they can gather materials for Rori’s medicine. They want to collect green water. But the hydrogen sulfide will kill them is Ginro doesn’t pay attention.
Ginro sees a mirage of a beautiful girl in the water and almost gets killed because he doesn’t notice the sulfuric acid turning the spear black. Kohaku thinks she can outrun the acid, but Senku assures her that her speed won’t be enough to outrun the poison.
The decide to great gas masks, but Senku makes Chrome stay behind in case the masks don’t work. Chrome is the only other person in the Kingdom of Science that knows how to create Rori’s cure and will pass down the knowledge. Chrome refuses because Senku is his friend. After some back and forth, Chrome and Senku agree to have each other back while gathering the materials.
Meanwhile, Kohaku is approached by her father to take the place of her sister as the town priestess. She refuses and vows to save Rori using the medicine Senku and Chrome are planning to create. She is assured that Chrome loves her sister and thus will save her life.
Senku and Chrome prepare to go back to the green lack again. Ginro is afraid so Senku takes his spear and they leave.
Kaseki, our resident craftsman, is still around. He gives some knowledge to Ginro about being able to work through his fear versus giving up and letting his fear consume him using willpower. Kaseki made another mask to give Ginro a change to help Chrome and Senku.
Back with Chrome and Senku, Chrome slips and falls off the cliff headed straight into the green lake of sulfuric acid. Ginro arrives just in time to save his life.
After a moment of heroism, Ginro freezes with fear after seeing his spear turn black. But Senku and Chrome help him calm down and gain control over his fear. And they obtain Sulfuric acid!