Taiju and Yuzuriha figure out Senku's secret to reviving him. But now that he's back, they need to deal with Tsukasa.

Kohaku shows Senku to her village, but it's going to take some convincing before they let him in. In the meantime, he makes friends with a like-minded, promising "sorcerer."

Kohaku's sister, village priestess Ruri, is gravely ill. Senku, Chrome and Kohaku begin their quest to make antibiotics to save her life.

Senku starts a ramen stand in hopes of winning over support for his kingdom of science, but some people are too principled to take such a bribe. Mentalist Asagiri Gen is not one of them.

Senku and his kingdom of science successfully test the first lightbulb since the collapse. Meanwhile, Asagiri Gen, a spy from Tsukasa's empire, is killed by an unknown attacker.

The development of glassworks, an important step for making sulfa drugs and for chemistry as a whole, turns out to have a surprising benefit for Suika.

To make antibiotics, Senku and his kingdom need to obtain sulfuric acid from a fountain of the stuff. The team goes prepared, but there's no guarantee that they'll make it back alive.