We begin with Senku presenting a concealed earpiece designed as a piece of jewelry. This piece is intended for Kohaku, who is participating in an undercover mission to infiltrate the master's palace.

Senku's primary goal is to secure the petrification device, a powerful tool capable of turning living organisms into stone. His plan involves seizing the device the moment Kirisame, a devoted warrior serving the master, attempts to throw it. Senku believes they can distract Kirisame's attention through Kohaku and other allies to take possession of the device.

To achieve this, Senku proposes building a drone capable of snatching the device mid-air. Despite the skepticism of Gen, the mentalist, Senku is confident that this seemingly ambitious plan can be executed with a properly constructed motor.

As part of the undercover mission, Kohaku, who cannot write, must send encrypted picture messages to Senku. In this episode, the coded message she sends reveals that they have found the platinum they originally sought.

After deciphering Kohaku's message, Senku realizes they now possess the necessary ingredient to produce an unlimited supply of the revival fluid. This serum can reverse the petrification process, giving them the ability to save all those affected on the island and the ship.

Throughout the episode, the balance between humor and the serious progression of the plot keeps viewers engaged. Despite the apparent implausibility of some of Senku's inventions, the story remains grounded, blending elements of fantastic innovation with the practical reality of their situation.

The episode concludes with a preview of the upcoming mid-season finale, where much is at stake.