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The Culmination of Two Million Years (200万年の結晶 Ni-hyaku-man-nen no Kesshō) is the fifteenth episode of the Dr. Stone anime.


With Magma defeated, it's down to Senku and Ginro to take the throne. Although both are on the same team, one is driven by personal greed and opportunism. The fight is on!

Plot Details

Senku beats Ginro.

Ginro tells Ruri that Senku and he will forfeit their fight and Chrome will be the winner, just as she would prefer. However, being in that position, Ruri states she would marry the winner, no matter who he is. Ginro misunderstands it like she had no preference. As the second semi-final between him and Senku starts, Ginro takes Senku seriously as he had imagined himself as the village chief and quickly turns the crowd against him with his fantasies. Chrome throws Suika's mask to Senku. Seeing that, Ginro decides to act quickly before he uses some crazy sorcery, however Senku uses the mask as leverage and smacks Ginro in the balls, knocking him out and taking the victory.

Alcohol obtained!

Next is the final and Senku intends to lose on purpose, so Chrome can marry Ruri. However, Chrome is unconscious and unable to fight. Everyone is shocked, but having no choice, they announce Senku as the winner, and the man that will marry Ruri and become the village chief. Senku agrees to do it and asks them to bring the wine. Ruri caught blood and Senku realizes they are almost out of time. He wants to make antibiotics, but the villagers explain he first need to celebrate all night. Hearing that, Senku then announced his divorce and takes the alcohol with him and heads to make the medicine.

Ruri takes the medicine.

Returning to their base, Senku leaves Kaseki and Gen Asagiri watch over a spinning bamboo at a waterfall. At their base as first step Senku takes burned coal and wash it with hydrochloric acid, then adds ethyl acetate made from alcohol and vinegar to get anilin. They proceed to do 25 more steps. In the morning, Gen is eager to see what is inside the bamboo and is surprised its carbonated water. Happy that Senku may indeed be making cola, he returns to their base to find Senku and the rest lying on the ground with as experiment seemingly went wrong. Senku explains how he mixed some things and it caused a small explosion. Taking the carbonated water, Senku mix it with sodium hydroxide and created baking soda. After mixing the last ingredients, after six months of hard work, Senku created the sulfa drug.

Ruri makes complete recovery.

The group heads into the village, but as Gen isn't allowed, he has to stay out. Senku tells him to stay and wait for them in the lab. Gen is disappointed he can't see Ruri getting better, but entering the lab, he sees a bottle of Senku's cola on the table and happily drinks it. Senku's group meet with Ruri and he gives her the medicine. As he examines her, he sees a dead mouse and takes it back to his lab. Making an autopsy, Senku confirms the mouse also has bacterial infection and explains that depending on the bacteria his cure may not work. Moments later, Suika calls them as Ruri got worse. Seeing Ruri's condition getting worse, Senku admits it may be due to his medicine and explains the bacteria is getting serious and is making allies by spreading its toxic genes into the harmless bacteria around it. That is pneumococcus bacteria's special move, making him realize Ruri has pneumonia, but his medicine completely destroys pneumococcus bacteria. If they keep giving it the medicine, she will recover. With everyone support, Kokuyo and the rest accept. Soon Ruri makes a complete recovery. Kokuyo announces Senku as the village chief of Ishigami Village. Hearing Ishigami name surprises Senku and Ruri tells him she is aware his name is Senku Ishigami.



  • Ishigami village
  • Kingdom of Science
  • A small waterfall by the river

Inventions and Discoveries

  • Water carbonating machine
    • Carbonated water
  • Various intermediate chemicals of the sulfa drug process: Ethyl acetate, Anilin, glacial acetic acid, ketene, acetic anhydride, acetanilide, P-acetamidobenzenesulfonyl chloride, P-acetamidobenzenesulfonic acid, sodium bicarbonate.
    • Sulfanilamide antibiotics
  • Senku Cola
  • Stethoscope (makeshift, using a beaker as such)
  • Autopsy (of a mouse)
    • Scalpel and face mask

Anime to Manga Differences

  • A scene was extended within the events of chapter 41, which heavily implied that Ruri told Kokuyo to make Senku the next village chief. In the manga, it seemed like it was Kokuyo's idea though it was not specified.

Site Navigation

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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
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 35
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
New Stone World Arc
Chapters 194195196197198199200
Europe Arc
Chapters 201202203204205206207208209210211