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Sorcery Showdown ( (よう) (じゅつ) (けっ) (せん) Yōjutsu Kessen) is the eighteenth chapter of the Dr. Stone manga.

Summary

Kinro and Ginro are still attempting to battle the soap bubbles blown by Senku. The latter of the brothers eventually gives up and opts to use his personal special technique: running away and letting it be someone else's problem.

As he's leaving, he spots the perfect candidate to take the burden, and thus Chrome makes his debut; Kohaku mentions it's good that he showed up, as it saves them the trouble of searching for him.

Chrome boasts about being a very smart genius sorcerer, and calls out the brothers for being scared of such crude sorcery, explaining that he can make as many bubbles as he wants from charcoal lye. This remark catches Senku's attention.

Kinro states that they weren't scared, just cautious; Ginro admitted that he was actually scared. Never the less, Chrome defends that he won't be upstaged by an outsider, and challenges Senku to a sorcery battle.

Under the argument of not getting the village caught up in this ''battle'' they move over to a clear area of the forest, where Chrome's storage shed stands. He asks his audience to wait outside as he rushes in to retrieve something. It becomes clear the change of location was just so he could access his equipment.

He lights up a large campfire and tells everyone to stand back as he does what he calls ''Rainbow Bridge''. The fire starts bursting into a myriad of colors as he tosses mysterious powders into it. Senku however sees though this play, and points out it's a flame test reaction, starting to enumerate the chemicals Chrome tossed in.

Expecting Senku to either submit or run away in fear, Chrome struggles to keep his cool. He runs inside and comes back with a spherical object he frantically rubs with his hand. Almost out of breath, he reaches to the tip of Ginro's nose with his finger, and he jumps back in shock, saying that it hurt.

Senku takes this item from him and identifies is as a ball of sulfur, even being able to tell how Chrome crafted it, which he finds pretty ingenious. He also praises his discovery, as the sulfur ball electrostatic generator was not invented until the seventeenth century. However he then questions why rubbing it with hands when leather works much better, which he tries with his science flag while standing on top of a boulder. His hair begins to stand up, and Chrome gets the shock of his life when Senku reaches to touch him.

Kohaku and Ginro hold the ball and have their hairs stand up. Senku is unimpressed, and about to call out how primitive his science experiments were, but he stops halfway, realizing that Chrome is indeed primitive yet he discovered all the things he showed off, collecting and experimenting by himself with everything he kept in his storehouse.

Senku is then happy to see that even without any modern humans, there would always be people with the spark of curiosity that drove scientific discovery. He tells Chrome that this makes him one of the people Tsukasa would surely murder (though Chrome has no idea what he's going on about), and says that he'd love to have him and his resources for the kingdom of science. Chrome, finding himself cornered, challenges Senku to a last battle for the shed. Chrome's choice is the one skill no one has ever beat him at: arithmetic.

And thus, Chrome and his shed became part of the Kingdom of Science.

Side Story: Chrome VS Senku Arithme-battle

Chrome gets ready to face Senku on a battle of numbers. He starts his offense with "8 x 8 = ?", shooting as an energy beam from his hands. This attack is deflected by both Senku and Kohaku, pointing out it's 64. Chrome is mortified by this, not expecting her to know any arithmetic. She elaborates that she's found a good use for multiplication, which is to estimate the quantity of a school of fish when fishing (which she apparently does by wielding her knives and body slamming the river).

Finding his first attack to be severely lacking strength, Chrome makes his next move, conjuring a massive energy ball he blasts Kohaku with: ''83 x 87 = ?''. The attack managed to defeat Kohaku and disintegrate her dress, ''How on earth could anyone know that?!'' she exclaimed in shock, but Senku, standing a few meters behind her, deflected it as well with a mere puff of breath answering 7221.

Chrome is growing desperate, as Senku sees through his strategy and explains that what Chrome is doing is using a quick solve method, which gives a fast answer to a two digit multiplication when the tens places are the same and the ones places add to 10. Multiplying the ones places gives the first two digits, and the square of the tenths place plus one gives the next two digits.

Chrome is brought to his knees, but annoyed, Kinro steps in questioning the value of this whole display, as for his perspective, arithmetic is useless for battle. In an attempt to save face, Chrome argues that it could be used to analyze the power levels of fighters, with Kohaku adding that this could help balance team bouts.

She then goes on to assess the power levels of those present. Putting aside modestly, she scores herself with a power level of 1000, then come Kinro with 500, Ginro with 100, Chrome with 5, and Senku with 3. Senku accepted this estimation if the condition is not having his science to work with. Chrome complained about being so low, and so did Kinro, saying he was underestimated.

To settle this conundrum, she offers a sparring match. Chrome calls it an impossible game, while Ginro, definitely not out of cowardice, suggest they all team up against her and thus she wont have a chance.

Chrome calls his stance validated with Senku adding that indeed, 500 + 100 + 5 + 3 < 1000, as all four of them lay in a pile, heavily bruised while Kohaku triumphantly stands without a scratch.

Characters in Order of Appearance

Chapter Notes

  • Ginro is scared of soap bubbles.
  • Chrome makes his debut. A somewhat cocky teen who calls himself a sorcerer.
    • Chrome discovered charcoal lye, the flame test, the sulfur ball generator and a multiplication quick-solve method by himself.
      • Senku is impressed with the discoveries he's made in the stone world with no knowledge of old world science.
    • Chrome challenges Senku to a sorcery showdown just to show off. Later they put themselves at stake and Chrome loses.
    • Chrome and his belongings become part of the Kingdom of Science.
  • A new location, Chrome's shed is introduced, and becomes the new home base of the Kingom of Science.
  • Kohaku fishes with swords and knows very basic arithmetic.
  • Kohaku estimates the power levels of a few people:
    • Herself: 1000
    • Kinro: 500
    • Ginro: 100
    • Chrome: 5
    • Senku: 3
      • Senku, Chrome, Ginro and Kinro try to fight her four on one, they get a beating out of it.

Trivia

  • The flame test involves introducing substances to a flame, causing a change of colour as this causes certain elements to emit light in their specific emission spectrum. Visually this causes different colours, but paired with a spectroscope, it was useful and involved in the discovery of many chemical elements.
  • The sulfur ball generator was invented by Otto von Guericke in 1663, it was the first electrostatic generator.
  • Chrome's attacks during the arithme-battle visually resemble the Kamehameha and the Genki-dama from the Dragon Ball series.

Site Navigation

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Chapters and Volumes
Volume 1 1234567Extras
Volume 2 89101112131416Extras
Volume 3 17181519202122232425Extras
Volume 4 262728293031323334Extras
Volume 5 353637383940414243Extras
Volume 6 444546474849505152Extras
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Volume 12 9899100101102103104105106Extras
Volume 13 107108109110111112113114115Extras
Volume 14 116117118119120121122123124Extras
Volume 15 125126127128129130131132133Extras
Volume 16 134135136137138139140141142Extras
Volume 17 143144145146147148149150151Extras
Volume 18 152153154155156157158159160
Volume 19 161162163164165166167168169
Volume 20 170171172173174175176177178
Volume 21 179180181182183184185186187
Volume 22 188189190191192193194195196
Chapters not yet in tankōbon format 197198199200201202203204205206207208209210211212213214
[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 35
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
Episodes
New Stone World Arc
Chapters 194195196197198199200
Episodes
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Episodes
Stone to Space Saga
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