Episode 9

Episode 9
Let There Be the Light of Science
Romaji	Kono Te ni Kagaku no Akari o
Japanese	この手に科学の灯を
JP Air Date	August 30, 2019
U.S. Air Date	September 13, 2019 October 20, 2019 (Toonami)
Adapted From	Chapter 23 Chapter 24 Chapter 25 (p. 2-18)
Arc	Kingdom of Science Arc
Opening Song	Good Morning World! - BURNOUT SYNDROMES
Ending Song	LIFE - Rude-α
Episode Guide
← Episode 8
Episode 10 →

Let There Be the Light of Science (この手に科学の灯を, Kono Te ni Kagaku no Akari o) is the ninth episode of the Dr. Stone anime.

Summary

During their ramen patronage, the gang are approached by Gen Asagiri, a magician from Senku's time, who had been sent by Tsukasa to confirm Senku's death, but decides to give a false report instead. Using the successfully completed iron, Senku takes advantage of a sudden thunderstorm to turn it into powerful magnets. Using these, the gang build a power generator which they manage to convince Kinro and Ginro to operate, leading to the reinvention of the lightbulb.

Plot Details

A mysterious man approaches through the woods. Just outside the village, Senku is serving fox millet ramen that many of the villagers are enjoying. Chrome tries to share it with Kinro and Ginro but the latter refuses despite accepting a golden spear. Word of the foot even reaches the village chief. Senku plans to work with everyone who eats so they can power his furnace.

Gen Asagiri of the Tsukasa Empire.

The mysterious man from earlier sits down and has a bowl too. He mentions it's making him thirsty for a cola. Senku notices he uses a term from his time and Kohaku calls him out as an intruder. Kohaku, Kinro, and Ginro surround him with their weapons and question's if he's with Tsukasa. The boy claims he's been alone ever since he was unpetrified.

Senku recognizes the man as Asagiri Gen, the mentalist who used to write books. The magician apologizes for taking some ramen and asks the guards to lower their weapons. Kohaku doesn't believe a word he says as Asagiri tries to explain himself. Senku says it doesn't matter and makes everyone work on the iron mill furnace. While Asagiri is working hard, Senku takes advantage of his exhaustion and asks him about Taiju. Asagiri admits he's with Tsukasa and claims thing have changed now that he's seen them create iron.

Senku creates a magnet using lightning.

Asagiri admits Tsukasa's side looks better for now and he simply sides with whoever will win. Senku believes he can win him over and starts working to prepare a generator. A thunderstorm hits and Senku gets his group ready to catch some lightning. They start the process but are interrupted by the untimely arrival of Magma, the village brute. Asagiri manages to turn them back around by using some convincing magic.

Senku's group travels to the bald mount and prepares to harness the lightning to create a magnet. The lightning closes in faster than expected, so they don't have time to build a tower. Kohaku steals Ginro's speer and turns it into a lightning rod. Lightning strikes the rod wrapped in copper and successfully transforms it into a strong magnet.

Senku lights up the darkness for the first time in 3,700 years.

Kohaku holds the poles backward and mistakenly thinks they failed to make magnets. Senku corrects her and Chrome gets pumped to make electricity. Asagiri asks what kind of generator Senku plans on building and isn't surprised to learn it's going to be man-powered. Together, they spend today creating a dual crank power generator. Asagiri convinces Ginro and Kinro to power it for them because they need a pair in perfect sync. Despite sticking around this long, Asagiri really questions if Senku can use electricity.

Senku asks Chrome if he's afraid at night because of its dark. Edison created the lightbulb and conquered the 24 hour day. Senku believes there is no darkness in him time and humanity defeated the night using science. He uses a bamboo string to imitate a lightbulb and lights up the night for the first time in 3,700 years.

Characters

Main

• Senku Ishigami
• Chrome
• Kohaku

Supporting

• Suika
• Kinro
• Ginro
• Ruri
• Jasper
• Turquoise
• Kokuyo

New

• Gen Asagiri
• Magma

Mentioned

• Taiju Oki
• Yuzuriha Ogawa
• Tsukasa Shishio

Locations

• Ishigami Village
  • Chrome's Shed
• Bald Mountain

Inventions

• Iron Mill Furnance, Level 2
• Iron
• Copper Wire
• Powerful Magnets
• Power Generator
• Lightbulb

Anime to Manga Differences

• In the manga, it was Kohaku that teased Kinro about accepting the gold spear and not food while it is replaced with Chrome in the anime.
• The detail about how level 2 pump and electric generator are omitted in the anime.
• The imagination of Gen when thinking about either joining Tsukasa or Senku is changed from Gen bathing in a balance with idols while it is in a hot spring in the anime.
• Panels showing light bulb and Thomas Edison are omitted in the anime.
• A short backstory about Senku during primary school is omitted in this episode.