Original subtitles

We have to learn all the secrets of rockets.

We have to come to understand all that confusing math.

So please, teach us how to calculate.

It's true that I had a side gig teaching math

at university so I could keep myself fed while I was writing code...

But it isn't easy. And you'll be starting from scratch.

You're serious, aren't you?

Hell yeah! Dead serious!

Hell yeah! Dead serious!

Because, well, we have to build our return trip rocket before

Senku's finished his moon rocket so that

we can all be here to celebrate our happy ending!

Damn it!

I came all this way to get away from building that damn computer!

Turns out building a rocket is no easier!

Let me get this straight...

We're building this vehicle, this "rocket," out of these red rocks?

Nah, we're processing it to Hell and back.

Here's a rough sketch of

the road map for making the raw material for the rocket body.

Red rocks (Bauxite)

Sodium hydroxide

Alumina

An absolute crap-ton of stupid powerful electricity

Aluminum

Fluorite

Copper

Magnesium

Duralumin

That's mega complicated and challenging, but I'm pumped!

So this is where we're using those so-called "firefly rocks" we got in Spain.

Looks like it's going to be some more insanely time-consuming work.

But that aside... what is this?

"An absolute crap-ton of stupid powerful electricity"?

Yeah.

There's a reason they call aluminum "canned electricity."

It takes a ridiculous amount of electricity to make.

For example, the aluminum that went into the Apollo rocket...

cost three billion yen in power bills alone!

And the only way we're going to get a limitless supply of

such immense power in the Stone World...

...is a hydroelectric dam.

Which is why we're taking all these red stones

to a country that's perfect for doing hydro power.

Where's the best country for... water? Power?

You're all familiar, aren't you?

Somewhere with lots of peaks and valleys, rivers everywhere...

Oh, that's funny! We have both the materials and a headquarters there.

We've got just the spot, remember?

Japan!

All the towns of the world will get together!

And it just so happens we'll be bringing all the materials

to our homeland to build it there!

Yeah.

The moon rocket will be made in Japan.

We've done a tour around the world to gather materials for the rocket.

Does that mean we're finally...

Yeah, this is the last stop on our worldwide city-building tour.

For real?!

Aw, yeah!

There it is!

Our destination is just south of the equator:

Indonesia!

Lawl, rubber trees everywhere!

We did gather some in central South America,

but it doesn't compare to the true home of rubber.

This is so great, I could cry.

We can use all the rubber we can get.

Rubber City founded!!

It's been a long journey.

We left Japan behind, crossed the Pacific, and arrived in the Americas.

We overcame countless challenges and succeeded in starting Corn City.

At each step of the way, we brought people back to life.

We built the city of superalloys, the city of fluorite,

the city of maths and fuel, the city of aluminum...

and lastly, this city of rubber.

And now, finally...

we're sailing back home to Japan to be reunited with the others!

The whole of humanity is coming together for this.

This might accidentally be the first time in human history.

Yeah!

We're all coming together!

We're building it.

We're building a round-trip rocket that'll let all of us

stand together against Why-Man.

Yeah. We're getting everyone...

out of petrification!

We're building the rocket in Japan.

We need everyone to work their asses off!

You could afford to be a little more sentimental.

I wish we could tell Ruri-nee

and the others who are petrified that we're almost through this hell.

I think the actual hell comes after they're awake.

What I really want is a gift or two to bring home from our travels

across the world.

That's always been the plan.

Huh? A gift?

You're so nice. Such an awesome friend.

No, knowing Senku-chan, he's definitely scheming something again.

We've been doing it all the time, no?

Everywhere we've landed, we made the local cuisine.

Soul food will bring out the power in all the people we wake up.

True!

Having familiar food makes all the difference when you want to go all-out!

I thought you just wanted some to have for yourself.

I definitely just want some for myself.

We know.

Japan's soul food...

We're in luck!

Look at all this wild rice that just happens to be in season!

It isn't luck.

Senku-chan would have been screwed if he ever counted on being lucky.

He must have chosen to come at the end of the journey in April,

when the rice is ready after the rain.

Rice acquired!!

So this is it, huh?

It's not that much.

Well, nature does what it wants.

Which is why we're getting humans in the loop by making a rice paddy

to really jack up production.

Go ahead.

Okay.

All right, next.

Got it.

Therefore, if you know the lengths of the three sides of the triangle,

you can find its area.

And by segmenting an area into countless triangles,

you can calculate the size of any plot of land.

A little to the right.

Okay, go ahead and dig a channel straight to this spot.

Piece of cake.

Perfect!

Is it really a good idea to plant crops so soon?

Isn't it usually every other year or something?

It'll be fine, ten billion percent.

There are no winters here.

Right, we're just south of the equator...

I don't get it at all.

How could there be no winter?

Triannual harvest.

We plant and harvest three times a year, with the power of science.

We just need to rejuvenate the soil with fertilizer after each harvest.

Greed is good indeed.

Yo, isn't this that stuff we got right before we arrived in Australia?

What was it... Those pink rocks he made us dig up on that weird island.

Yup.

Albatross droppings from the island of Nauru.

Phosphate rocks.

Phosphate rocks

Nitric acid

Plant ashes

It makes for a powerful fertilizer.

Hooah!

(A bounty of) rice acquired!!

We're in luck!

This stuff has high amylopectin content, even though it's Indica rice.

Meaning it's similar to Japanese rice.

In that case...

It's amazing.

I don't get it.

It wasn't like I had rice balls that often in the 21st century.

There could be no better gift!

Am I right?

Let us now return to where we started!

To Japan!

'Sup, Soyuz?

Senku.

Kohaku-chan!

Amaryllis!

Huh?!

We're on Treasure Island, aren't we? Who's this Japanese uncle?

That's right, I'm an uncle from Japan. Sue me.

So you're that Senku kid I've been hearing about!

My kids told me all about you!

Yo, what's up with those dudes?

They're on a bit of a special mission.

A special mission?

So, how's progress?

R-Right.

Well, we were all petrified, so we didn't make all that much progress.

The backup and resources from the mainland have helped.

You've really grown into your head role, Soyuz-chan.

Anyway...

I'm more worried about Ruri-sama and the others back on mainland Japan.

There's a lot of people there.

I wonder what's happened since they were petrified.

Yeah. It's time to go check.

All the more reason to hurry back to Japan!

The team back home must be working on some hard missions.

I guess we weren't the only ones going through hell.

Here I was, getting jealous of how much free time they must have.

Why would you think that?

Ten years since the new Medusa petrified the world.

After a trip around the planet...

We return to Japan victorious!

Kohaku! Thank goodness you're safe!

You're more worried about me than yourself, huh?

You haven't changed, Ruri-nee.

Wait, what happened to her arms?

How is Ruri-chan so strong?

Gotta keep in mind, she and Kohaku are sisters.

They're both gorilla-level brutes.

It's been a while.

And that's our one and only casualty.

Chrome!

Oh, crap, that's right!

You were petrified all this time.

We're the same age now, Ruri.

It looks to me like you've grown quite a bit, Chrome.

I got it!

Chrome and Ruri are in lovesies!

Yup!

Ain't no one in the village who doesn't love Ruri!

I-Is that so? I appreciate it.

Aw...

I guess they aren't making any progress

because Chrome-chan's too much of a child.

Child inside a man's body.

Too bad Chelsea didn't go all the way like she usually does.

Man, you're amazing, Ruri.

When did you find the time to make this giant stone windshield wall?

It would've been game over

if the statues got smashed by trees and whatever other debris.

No, I don't recognize this wall.

Chalk...

Sagara...

Of course...

Chalk-chan and Sagara-chan aren't humans,

so the petrification beam never affected them.

Good job hanging on for ten whole years.

A stone wall...

You've...

You've been protecting everyone all this time.

I see.

You both have families now.

Bye-bye, Chalk, Sagara.

You've woken up so many all at once.

Are we going to have enough food?

That's what the gift is for!

Huh, they're back to get food.

So much for that heartfelt farewell.

Looks like we're going to be living together, hunting and foraging and stuff.

The rice dish that will help provide strength for us all...

Not rice balls?

Have you forgotten the Japanese soul food made from rice?

Sushi acquired!!

Everyone's gonna have to work extra hard on the special mission now.

What's that?

The guys were talking about it on Treasure Island, too.

Yes, Senku-san designed something for us to work on here in Japan

while the rest of you were traveling the world.

A d-dam?!

So we're using the hydro power generated here

to make the aluminum for the rocket body!

The way it works is stupid simple.

We're just stopping water with concrete.

There was a dam from 1000 BC that we were using in the 21st century.

Chalk-chan and Sagara-chan must have gotten the idea from this dam.

I like it!

They put bamboo inside the rocks?

It's bamboo-concrete instead of ferro-concrete.

A dam just needs to withstand the water pressure—the pushing force.

So all you really need is bamboo to reinforce it for the most part.

We made parts all over the world, gathered them,

and leveraged the fact that Treasure Island is close to the equator...

It's coming together!

Our special mission to build the rocket launch site!

We only have one enemy: the mysterious Why-Man!

Let us go forth into space!

With the might of all humanity!

This is exhilarating!

Next Episode

This is a work of fiction, but the plants, animals, and production methods described are based on reality. Foraging and making things on your own accord is extremely dangerous and, in some cases, illegal. Please do not imitate without expertise.