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Linking the Circuit Diagram ( (つな) がる (かい) () () Tsunagaru Kairozu) is the two hundred and seventh chapter of the Dr. Stone manga.


The chapter begins with the team in Corn City assembling several parametrons. In India, Sai puts together several half adder circuits to create a circuit capable of adding up to 255. They need to send the circuit diagram over to Corn City, so Xeno recommends creating a fax machine. He already sent instructions over to Brody with Taiju, so all that's left is for Senku to make one. Using sphalerite and other materials, they quickly make thermal paper and the fax machine itself.

As the team in Corn City are making the computer, Senku's team can continue their globetrotting. Sai bids them farewell, insisting that he stay in India to work. However Ryusui insists that Sai come with them. Some time later, they receive their first fax from Corn City, featuring an image of most of the group there.

Seeing the image makes Sai and Ryusui go quiet, so Gen sneaks away later to dig for information. Before he can begin questioning Sai, Chelsea breaks into the room and starts asking blunt questions. Sai then explains over tea that Ryusui and Sai weren't born to the matriarch of the Nanami family and were excluded from group photos. Sai also found Ryusui's constant demands to be overwhelming, so he flew to India to escape. Gen and Chelsea then explain to Sai that Ryusui was never demanding those things of Sai, only that he wished to spend time with his brother.

That evening, Ryusui enters Sai's room and asks to play chess once more, and Sai begins turning him down but then cedes. When the Perseus is all packed up to go, Sai had a change of heart and joins the others onboard, officially joining the Kingdom of Science.

Characters in Order of Appearance[]

Chapter Notes[]

  • A larger adder circuit is made.
  • A proper fax machine is built to send schematics over to Corn City.
  • It is revealed that Sai and Ryusui are not born to the matriarch of the Nanami family and were treated different.
    • Sai hated Ryusui for trying to exploit him.
  • Gen and Chelsea speak to Sai, making him realize that it wasn't exploitation, but a want to spend time with his brother.
  • Sai joins the Kingdom of Science onboard the Perseus.


  • Despite the chapter publishing on his birthday, Magma is not present in this chapter.

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