Original subtitles

I want to make a mobile phone

in this Stone World.

But it's not a smartphone.

It only has the call function.

We can do this!

We were even able to make sulfa drugs that took a lot of effort!

Hey.

You can say that because you don't know.

This roadmap requires a lot of materials that are impossible to get.

Nothing is impossible.

WINE

No matter how impossible it may seem,

as long as we follow the rules,

I'm ten billion percent sure that we can achieve the goal.

That is what science is about.

We only have a few months to finish it.

What are you talking about?

It's the time when Tsukasa would launch an attack.

What do you think, Mentalist?

Well,

based on Tsukasa's perspective,

"We have the revival fluid.

The more time we have, the more manpower we'll get.

Yes.

But our opponent is Senku.

If we give him a lot of time,

perhaps he can start mass-producing gunpowder."

Your voice impersonation is way too accurate.

We must be fully prepared to defeat Senku once and for all.

To prepare for winter,

our manpower will also be dispersed.

Also, Hyoga, based on the information that you've provided,

the Kingdom of Science is a fortress on water.

Yes.

With the protection of the frozen lake during winter,

if they hold the fort, it will be difficult to attack.

If we attack them, our morale and food will not sustain us for long.

Hey.

If Tsukasa finds out that Senku is still alive,

wouldn't Taiju and Yuzuriha be in danger?

Won't he kill them?

That's not a problem.

To him, they are hostages.

He won't treat them badly.

Is it really fine to leave Taiju and Yuzuriha be?

I'll arrange for spies to monitor them.

However, treat them the same as before.

Don't let them notice anything.

Even if Taiju and Yuzuriha are spies,

in this world,

there is no way for them to communicate.

Yes.

But more importantly, we should be more worried

if Senku might attack us first.

I've already sent Homura to watch them.

But since there is no way to communicate with her,

there will be a delay in getting information.

How ironic.

The importance of communication and information transfer

is especially important in such a primitive battle.

The rules of the game are very simple.

To attack and defeat Tsukasa,

we must make a mobile phone.

So, the battle will happen

right after the winter snow melts.

Our time limit is spring.

It feels so different with so many people working together.

This is the result of Senku securing the village chief position.

It's truly a good thing.

Creating mobile phones in Stone World

is an extremely large-scale project.

There are countless hurdles we need to clear.

By the way, tell me the principle

of how mobile phones can communicate

even in far distances!

What exactly is the principle?

Explain it to me nicely!

You guys are too close!

Why are you so excited?

Listen carefully.

To put it simply, your voice is a vibration of air.

It vibrates against the diaphragm

and it generates a tiny current corresponding to the rhythm.

That's cool!

That's cool!

-That's cool! -The current is way too small,

-That's cool! -so we need to magnify it.

This time, we need to use a vacuum tube.

Then just keep circulating the energy around

and that will send it flowing in a wave of power.

-That's cool! -That's called a radio wave.

The receiving end just needs to do the same in reverse.

That's cool!

I see! I think I understand half of it.

I don't understand it at all.

The IQ requirement for the explanation is too high.

My head hurts.

Just tell us where you want to start.

Well, for this very large-scale scientific project,

we must first create…

A cotton candy machine.

-Cot… -…ton…

-Candy… -Machine?

Yes.

The IQ requirement for the explanation

suddenly dropped by 100.

Is this really okay?

They are making something.

Is it a new weapon?

Isn't that…

If you put sugar crystals here and keep spinning it,

the centrifugal force pushes the molten sugar out through the small holes

which result in long and thin threads.

That's cotton candy.

What will happen if we place gold instead of sugar in it?

We can make gold threads!

You're right. Ten billion points for you.

I see. Like the wires in electronics.

The lowered IQ requirement finally went back up.

All right.

I'll go and get the gold.

Wait. Gold is too precious.

We can't afford failure.

Let's make cotton candy first.

We must at least test it.

You're right.

We must have a taste… No.

We must test it.

After that woman named Homura set the village on fire,

we lost a lot of potato wine and mirin that was almost ready.

It was burning for a long time.

Look at that.

It has turned into chunks on the rims of the barrels.

What are we doing with the damaged wine?

If we boil wine and mirin for a long time, we'll get this.

Sugar crystals.

What are those fluffy things?

That looks amazing!

It smells so good!

It's so white, like a cloud.

This is indescribable!

Even my bones are going to melt.

What's this?

Here, Dad. Try it.

This looks suspicious.

They have never had a decent snack before.

Yes.

It's just cotton candy,

but for someone who has never had it before,

it must be mind-blowing.

We need to thank Homura

who started the fire.

Gen.

Do you know what type of woman Homura is?

What the heck?

Are you interested in girls too, Senku?

Are petite girls your type?

No, I don't think that's the reason he asked that.

You don't know Senku at all.

We're being watched.

All of us are being watched by that woman named Homura.

I knew it.

After all, she's the only one that Hyoga trusts.

She's watching us even right now?

That's right.

She's in a position where she can immediately see if we're up to something.

If we all decide to run away, she can also immediately come after us.

I thought we would just run away if things got bad.

Running away isn't an option anyway.

Yes.

There are too many elders who can't handle the journey.

There are no cowards in this village

who would desert the elders.

That's right!

There is no one like that!

Well, Homura respects Hyoga a lot.

If Hyoga told her to watch us,

she would surely do it.

That's why she won't make trouble if we leave her be.

But it would be impossible for her to betray him.

COTTON CANDY

"Cotton candy?"

Don't worry.

I didn't poison it.

If you're worried that it's poisoned, you can feed some to an animal first.

You fool.

Of course, I won't eat it.

Senku, why did you give our enemy cotton candy?

Homura is watching us.

She'll tell Tsukasa Empire about the cotton candy.

Sweets are very tempting.

Some of them might rethink their allegiance.

I see.

You're as nasty as ever, Senku.

No, I meant that as a compliment.

I'm sure

he means that in a strategic way.

But perhaps Senku just wants…

He might just want

to share some candy with a girl.

That's what I think.

They wouldn't even abandon a village guard.

They are so naive.

I wouldn't die

just from tasting it, right?

It's so sweet.

SENKU'S PAVILION

Please enjoy it.

This cotton candy…

It's so fluffy and it melts on my tongue.

At the same time, it has a good amount of roughness.

However,

the inconsistency of cotton is defeating the flavor's balance.

I'll work hard to improve.

What the heck?

You just made me fool around in a silly way.

The balance of the cotton candy's taste doesn't matter at all!

So the phrase "fool around" was passed on through the generations.

Is it from the Hundred Stories?

That old man is ridiculous.

Do we really have so much time to waste?

Tsukasa is coming soon!

The mobile phone is not done yet!

Don't worry.

We're talking about important matters.

Is cotton candy's flavor considered important?

If the cotton candy ends up with a bunch of clumps,

the same would happen when we're making gold threads.

I see.

Nice!

Good thing we tested it with cotton candy first!

Before we put in the gold,

we must figure out what's causing the clumps.

We're always doing the last-minute trial-and-error again?

Over there!

Yes.

The moment when the rope is tugged in the opposite direction,

the rotation speed drops,

and that causes it to clump up.

Is there a way to make it work smoothly without losing speed?

How about using your brotherly bond?

Don't ask for the impossible.

Okay. Let's use a longer rope then.

-Use one which is a kilometer long. -We'll die!

What if we spin it by hand like that power generator there?

The speed isn't enough.

Let's rely on willpower then!

We should be able to do it if we take turns.

But we'll be lacking in manpower.

We need to prepare for winter.

We can't use all the manpower for scientific inventions.

It all comes back to that.

We can't increase manpower by using the revival fluid too.

We'll have to make it then.

It's a bit of work,

but the super craftsman, Master Kaseki, can pull it off.

We're making the revolutionized energy in human history.

We're making gears.

We happen to have Kohaku's shield.

Its shape is ten billion percent suitable for making wheels.

You're using that?

Didn't the village chief give that to his daughter, Kohaku,

to celebrate his victory?

A gift to Kohaku.

The champion of the Grand Bout Tournament, Kokuyo.

Congratulations!

This is so nice.

All right.

You can have it, Kohaku.

Thank you, Dad!

Dad!

Well, I don't mind.

But it's an important gift from her dad.

I wonder if Kohaku will agree.

No, I don't mind at all.

Practicality first.

She's so heartless!

This is incredible!

It's so easy!

I only have to go in one direction, and I can go slowly!

One person is enough to turn it!

GEAR OBTAINED!

Slowly?

In one direction?

It spins around and catches…

All right!

I have an idea!

This is going to be amazing!

What are you doing?

Just come with me!

All right. Let's get to work!

It's so suspicious.

What exactly is Chrome planning to do?

He must have something planned.

Just let him be.

When a boy is up to mischief, you're not supposed to look until he's done.

Now isn't the time to worry about others.

You're all in for hellish work.

Twist these gold threads together

into a super-thin wire that we'll work into a coil.

How long would you like it to be?

Well…

The length is from here

to that mountain!

So, we're relying heavily on manpower again.

It's great that you're the village chief, Senku.

We did it, Senku.

We haven't slept or rested

for three whole days.

This is…

I'm awesome too,

but it's this blade of science that's really awesome.

It would have never worked

if I didn't have this iron cutting tool.

This little thing here.

What do you think, Senku?

Isn't my invention great?

This is payback for when you got me good with the magnet!

You should be more surprised.

-It's a waterwheel. -You know what it is? Damn it!

A waterwheel?

I already have a name for it.

It's called the "Rumbling Cotton Candy Machine."

I think "waterwheel" is better.

I'm already very surprised.

With zero-knowledge of it,

I can't believe that you two made such a thing.

This is a way bigger deal than an automatic cotton candy machine.

We can use them for other things.

Kinro and Ginro worked so hard to spin that thing.

Could it be…

As long as we have gears and waterwheels,

the era of manual labor is over.

With an infinite contraption that requires no fuel,

we're finally harnessing the power of nature.

We're overcoming manpower

and entering the age of energy!

HYDROELECTRIC POWER PLANT OBTAINED!

NEXT EPISODE

THIS IS A WORK OF FICTION.

MATERIALS AND METHODS ARE BASED ON REALITY.

DO NOT ATTEMPT FOR YOUR SAFETY.

Subtitle translation by: Coleen Chua