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Friends Have Each Other's Backs ( () (なか) () わせの (なか) () たち Senaka Awase no Nakama Tachi) is the thirty-first chapter of Dr. Stone.


With the dangerous task ahead, Senku tells Chrome that he's going to inherit all 2 million years of humanity's scientific progress. Chrome says that's bad luck, but Senku says he doesn't intend to die, he's only trying to be practical. Chrome says that he's not going with that plan, and says that if Senku dies, so will science.

Kohaku overhears this conversation and remembers a situation years ago when she'd argued the same thing against her father. She refused to learn the 100 Tales if that meant Ruri could die. Instead, she vowed to keep carrying the hot water to her daily to keep her alive.

Senku continues arguing that their odds are best if only one of them goes, but Chrome insists having a scientist tag team will increase their odds even more. Senku finally relents after Chrome brings up the fact that Taiju and Yuzuriha are also risking their lives for him. He comments they'll have to make another gas mask thanks to him now.

Kohaku wistfully mentions that everyone would be happy if Ruri could marry someone like Chrome, but Chrome could never win the Grand Bout to even have the option to. Instead, Kohaku offers herself in marriage but Chrome calls her a gorilla.

With some extra crafting, another gas mask is made and the team is ready to confront Sulfurina once more.

Character in Order of Appearance[]

Chapter Notes[]

  • Senku wants Chrome to inherit his scientific knowledge in case he dies.
    • Chrome refuses it.
    • Kohaku did the same in a similar situation with her sister.
  • Another gas mask is made.

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Volume 1 1234567Extras
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Volume 27 Terraforming4D Science: 14D Science: 24D Science: 3
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Story Arcs
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
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Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
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Stone Wars Saga
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Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
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Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
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The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
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Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
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Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
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