I have a Dr Stone Theory
(contains recent manga spoiler & the spin off manga)
I doubt anyone watches it but I'll write it down here.
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So in chapter 138-139, senku and ruri got a strange signal coming from their telephones.
"12,800,000 meters, 1 second"
Ukyo confirms, "The voice dips into the uncanny valley, almost like a vocaloid's. It's a synthetic voice."
Once Senku finally deciphers it, the signal came from the "moon".
NOW THIS WHERE THE SPIN OFF MANGA TAKES PLACE.
Byakuya (Senku's Dad) and his friends already left the space craft and went to earth.
Leaving Byakuya's AI named Rei-37, all alone in the space craft.
In the spin off manga, it tells how Rei survives obstacles along the way and waiting Byakuya's promise to return to space.
Now my theory is that, Rei is the one sending signals to Senku and Ruri.
"The voice dips into the uncanny valley, almost like a vocaloid's. It's a synthetic voice."
But that's just a theory! A game theory!
Though I really hope, my theory is right. I still have to wait a long time. Until Senku arrives on the "moon".
Darn I'm sorry if my grammar is terrible. I'm just to hyped up.
✨Sincerely Akane✨