As Chise watches over Lucy in the infirmary, she's surprised by the familiar face who comes to visit. Meanwhile, the faculty discusses the mysterious disappearance of a dangerous tome.

Chise shares a meal with her new classmates, but several teachers and students at the College have their eyes on both her and Elias for reasons yet unknown. Chise and Elias head home for the weekend and Stella drops by for a visit.

Two separate conversations reveal the multitude of revelations that Chise and Elias have had about one another, and the ways they've both grown and changed. Hazel guides them on a dangerous shortcut back to the College.

Nikki becomes the first member of the Tsukasa Empire to convert to the kingdom of science. Meanwhile, with Chrome in mortal danger, Senku and the kingdom begin plotting a way to bring him back to safety.

Kaseki's efforts to build the science vessel Perseus hit a roadblock when he realizes that it's impossible to get all the parts to fit in practice.

The Perseus arrives at the treasure island. A recon squad consisting of Senku, Soyuz, Kohaku, and Gen set off to locate the platinum and make contact with the islanders. Ukyo later discovers something on the seafloor and send Ginro to investigate.

Amaryllis explains how she evaded petrification and how she came to her decision to sneak into the inner palace.

Amaryllis explains how she evaded petrification and how she came to her decision to sneak into the inner palace.

Suika and Ginro work together to rescue the mobile lab from the Perseus. Reunited with Senku and the others, the group works on items to help Kohaku with the selection process.

Despite the initial conflict, Eurazania and Tempest have deemed each other to be worthy of establishing friendly relations, and diplomacy between them officially begins. Tempest agrees to share its industrial techniques in return for Eurazania's agricu...

Despite the initial conflict, Eurazania and Tempest have deemed each other to be worthy of establishing friendly relations, and diplomacy between them officially begins. Tempest agrees to share its industrial techniques in return for Eurazania's agricu...

Kohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.