Dr. Stone Wiki
Dr. Stone Wiki

One Second, One Grain ( (いち) (びょう) 一粒 (ひとつぶ) Ichi-byō to Hitotsubu) is the 115th chapter of the Dr. Stone manga.


Having broken open the concrete slab, Kohaku discovers the jar left by Byakuya. However, she accidentally breaks it, alerting the guards to her presence. Taking its contents, she flees the scene, and using the Motor-powered Car, she transports them to Senku and the Science Team. Senku quickly realizes the contents include significant amounts of platinum.

In the past, Byakuya set out to acquire and stockpile platinum in case Senku was ever revived. He continued this for decades, eventually he grows old and collapses in a river, during his search. As he lays dying, he remarks on how fitting as an astronaut his last sight is night sky. Byakuya starts crying, thinking about his son while at the same time Senku is continuing his counting process.

In the present, Gen remarks on how alike Senku and his father are because of their shared persistence, Senku counting to stay awake and Byakuya collecting minerals for him. Senku then declares while Byakuya was not his biological father, things like that did not matter because they were connected in another way.

With the acquisition of platinum, Senku sets off to produce nitric acid, the key component of the Revival Fluid.

Characters in Order of Appearance[]

Chapter Notes[]

  • Platinum acquired!!
  • This chapter hosts the 2nd character poll.
  • It is revealed Byakuya was the one who gathered the platinum for Senku.
  • Senku reveals he is the child of Byakuya's good friend.
  • Approximately 21 years and 5 months after the Petrification, Senku is seen in the school hallway in which he was petrified. Byakuya is approximately in his 60s during this moment.
  • Approximately 32 years and 2 months after the Petrification, Byakuya dies. He's approximately in his 70s at the time.

Site Navigation[]

[v  e]
Chapters and Volumes
Volume 1 1234567Extras
Volume 2 89101112131416Extras
Volume 3 17181519202122232425Extras
Volume 4 262728293031323334Extras
Volume 5 353637383940414243Extras
Volume 6 444546474849505152Extras
Volume 7 535455565758596061Extras
Volume 8 626364656667686970Extras
Volume 9 717273747576777879Extras
Volume 10 808182838485868788Extras
Volume 11 899091929394959697Extras
Volume 12 9899100101102103104105106Extras
Volume 13 107108109110111112113114115Extras
Volume 14 116117118119120121122123124Extras
Volume 15 125126127128129130131132133Extras
Volume 16 134135136137138139140141142Extras
Volume 17 143144145146147148149150151Extras
Volume 18 152153154155156157158159160Extras
Volume 19 161162163164165166167168169Extras
Volume 20 170171172173174175176177178Extras
Volume 21 179180181182183184185186187Extras
Volume 22 188189190191192193194195196Extras
Volume 23 197198199200201202203204205Extras
Volume 24 206207208209210211212213214Extras
Volume 25 215216217218219220221222223Extras
Volume 26 224225226227228229230231232Extras
Volume 27 Terraforming4D Science: 14D Science: 24D Science: 3
[v  e]
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
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes 4142434445464748495051525354
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes 555657
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
New Stone World Arc
Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
Moon Mission Arc
Chapters 213214215216217218219220221222223224225226227228229230231232