One Second, One Grain (一秒と一粒 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 dying during his search.

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

Chapter Notes

  • Platinum acquired!!
  • This chapter hosts the 2nd character poll.
  • 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.

Characters in Order of Appearance

Site Navigation

v  e
Arcs & Sagas
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 2021222324
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156

Community content is available under CC-BY-SA unless otherwise noted.