After decoding Kohaku's letter Senku decides to make a 'silent bomb' in the form of plaster to break the concrete holding rare minerals, notably, platinum. Kohaku, with the help of Amaryllis and Ginro, obtains the contents in the concrete.

Senku builds Kohaku an earpiece to relay information, additionally giving her orders. Ginro and Kohaku devise a way to write a letter to Senku, but rather than use Kanji, they elect to use pictographs to communicate as they can't write.

Ginro and Suika manage to escape the ship with the lab car needed by Senku for the plan. The group escapes from the islanders, making them think the lab car's a beast. Senku uses the lab to give Kohaku a makeover as well as one of the men.

Amaryllis recounts a story from the past about how the petrification beam works, giving useful information. The group decides to head back to their ship to retrieve the lab and discover one of their crewmates has not been petrified.

Senku and the Perseus crew finally arrived at Treasure Island. To quietly find the sleeping platinum on its grounds, the crew deploys the recon team with Soyuz who is revealed to be one of the island's natives.

The science ship Perseus is completed, and begins its voyage to the uncharted routes with a selected Ishigami crew on board. Their destination and goal, the island where the ISS astronauts crash landed and where a "treasure chest" sleeps.

Thanks to Chrome's discovery, the Kingdom of Science has acquired a mine and founded its distribution network of iron and oil needed for minecarts, paved asphalt roads, all the necessary routes required for the ship roadmap.

"Whyman" suddenly sent an eerie message to Senku and the others. Senku, Ryusui, Chrome, Gen, and Ukyo, the five generals of the Kingdom of Science, began a strategic meeting to find out their true identity.

Senku and his search team continue looking for the Sagara Oil Fields before the snow deadline. Meanwhile, Suika and Francois go truffle hunting.

The Kingdom of Science will need rations to last them through their voyage to the other side of the world. But Senku, being no professional, burns all the bread he attempts to bake.

While continuing to use the hot air balloon to search for the oil, it's decided that Ishigami Village needs to take up agriculture to prevent future food shortages, as well as to produce preserved food for their upcoming sea voyage.