E4 - Fire the Smoke Signal
Source: Crunchyroll
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[00:08] (Flashback) Senku
Shishio Tsukasa is a good guy...
[00:11] (Flashback) Senku
and a murderer.
[00:15] (Flashback) Senku
If we make weapons of science
before he takes notice, we win.
[00:20] (Flashback) Senku
If he finds out first, we lose.
[00:23] (Flashback) Senku
That's the kind of race this is.
[00:25] (Flashback) Senku
Guns.
[00:27] (Flashback) Senku
We're making gunpowder.
[00:31] (Flashback) Senku
This is exhilarating.
[00:35] (Flashback) Tsukasa
Hakone.
[00:36] (Flashback) Tsukasa
If they make gunpowder,
I don't stand a chance.
[00:39] (Flashback) Tsukasa
I'm going to stop them
before Senku can make it.
[00:51] Taiju
Yuzuriha...
[00:53] Taiju
I should tell you about what
happened while you were petrified.
[00:59] Taiju
3,700 years ago, when I called
you to the camphor tree...
[01:06] (Flashback) Taiju
Hear me out, Yuzuriha.
[01:08] (Flashback) Taiju
For the past five years, I've...
[01:17] Yuzuriha
What were you about to say that day?
[01:31] Taiju
Yuzuriha, for the whole time I was petrified,
[01:35] Taiju
I thought about finishing what I was saying.
[01:38] Taiju
For hundreds of years, thousands of years...
[01:41] Taiju
But here, in this stone world,
[01:44] Taiju
with nowhere to run, I wouldn't
feel right as a man telling you.
[01:55] Taiju
Sorry! I'm sure you have no
idea what I'm talking about...
[02:00] Yuzuriha
No, I do.
[02:02] Taiju
We have to bring back civilization.
[02:05] Taiju
Once we save humanity,
[02:09] Taiju
will you let me finish what I was
saying 3,700 years ago, Yuzuriha?
[02:17] Yuzuriha
Okay, got it.
[02:19] Yuzuriha
We'll bring the world back.
[02:22] Yuzuriha
I'm sure of it.
SIGN Fire the Smoke Signal
[04:03] Senku
We have the three materials
we need to make gunpowder.
[04:07] Taiju
We have them already?
[04:08] Senku
All we need to do now is mix it.
[04:10] Senku
It's time for our happy
gunpowder cooking session!
SIGN Kitchen
[04:19] Senku
Ingredient number one for gunpowder...
[04:21] Senku
Sulfur, which we can get
plenty of at this hot spring.
[04:24] Senku
Number two...
[04:26] Senku
Charcoal.
[04:27] Senku
We can get all we need by burning wood.
[04:30] Senku
And number three,
[04:32] Senku
the last, but most difficult:
potassium nitrate.
[04:36] Senku
It'll take a hell of a long time
to make this stuff, so...
[04:39] Senku
Kukuku!
[04:40] Senku
I've already made some to save us time!
[04:47] Taiju
I feel like I've heard the
word "nitrate" somewhere...
[04:50] Taiju
Nitric acid!
[04:51] Taiju
Miracle water!
[04:53] Taiju
You got it from that cave?
[04:55] Senku
You're right for once, simpleton.
[04:57] Senku
Ten billion points for you.
[04:59] Senku
Potassium nitrate, sulfur,
and charcoal all go in the mix,
[05:04] Senku
and a pinch of sugar as a secret ingredient
gives it a little more oomph.
[05:08] Senku
This is glucose that I made from grapes.
[05:13] Senku
Hey! My name is Mecha-Senku!
[05:16] Senku
That recipe I just gave you is legit.
[05:19] Senku
It can result in a real bomb.
[05:21] Senku
So don't even think about trying it!
[05:25] Senku
Finally, pound it until it's packed solid.
[05:29] Taiju
Pound it, huh?!
[05:31] Taiju
Leave the heavy lifting to me!
[05:34] Yuzuriha
Are you sure that's a good idea?
[05:36] Yuzuriha
You might be strong enough to
make it spark and go boom!
[05:40] Yuzuriha
Like flint!
[05:42] Senku
Nah, you won't get any sparks
by hitting stone with stone.
[05:46] Yuzuriha
Really?
[05:51] Taiju
Oh, you're right.
[05:53] Senku
Flint is more than just stone.
[05:56] Senku
It needs to have metal in it to make sparks.
[05:59] Senku
Hot springs,
SIGN Hot Springs
[06:00] Senku
volcanoes,
SIGN Volcanoes
SIGN Iron
Pyrite
[06:01] Senku
iron pyrite...
SIGN Iron
Pyrite
[06:04] Senku
Iron pyrite?!
SIGN P
l
u
s
SIGN Taiju's
OP
Strength
[06:07] Senku
Wai—
[06:29] Senku
No problem!
[06:30] Senku
Our gunpowder cooking was a huge success!
[06:33] Yuzuriha
I had no idea gunpowder was so powerful.
[06:35] Senku
Yeah.
[06:37] Senku
There've been plenty of
accidents where students
[06:39] Senku
were experimenting with it
and got their limbs blown off.
[06:45] Senku
It can easily be lethal.
[06:48] Yuzuriha
We're going to attack
Tsukasa-kun with this?
[06:53] Senku
No, we're going to make a deal.
[06:57] Senku
Tsukasa isn't a mindless killer.
[07:00] Senku
Taiju, remember what he
said when you went at him?
[07:04] (Flashback) Tsukasa
Let me get this straight.
[07:06] (Flashback) Tsukasa
You'll let me keep hitting
you and never fight back,
[07:09] (Flashback) Tsukasa
therefore, don't destroy the statues.
[07:12] (Flashback) Tsukasa
Is that right?
[07:13] (Flashback) Taiju
That's right!
[07:15] (Flashback) Tsukasa
I don't understand.
[07:17] (Flashback) Tsukasa
There's no deal being made here.
[07:19] Senku
In other words, in the right circumstances,
we can negotiate with him.
[07:24] Senku
As long as we have a gunpowder
weapon, we have leverage.
[07:30] Senku
But if negotiations with
Tsukasa fall through,
[07:35] Senku
then we'll have to...
[07:39] Tsukasa
If Senku has already made gunpowder,
[07:44] Tsukasa
I'll have to...
[07:48] Tsukasa
...kill him.
[07:56] Taiju
All right, it's gotten a lot weaker.
[08:00] Senku
If Tsukasa's after us, there's a ten billion
percent chance he'll find us.
[08:08] Yuzuriha
Senku-kun, Taiju-kun...
[08:18] Senku
A smoke signal...
[08:20] Yuzuriha
Tsukasa-kun?!
[08:21] Senku
No, that's in the opposite direction.
[08:24] Senku
Besides, Tsukasa has no reason
to reveal his location.
[08:28] Taiju
What is it, then?
[08:29] Taiju
A forest fire?
[08:30] Senku
It's too well-timed to be a coincidence.
[08:32] Senku
It was clearly raised in
response to our smoke.
[08:36] Yuzuriha
You mean...
[08:37] Senku
Yeah.
[08:40] Senku
This is exhilarating.
[08:44] Senku
There's someone else in this stone world.
[08:49] Taiju
More people?
[08:52] Yuzuriha
We have to finish putting out the fire.
[08:55] Taiju
Oh, that's right.
[08:57] Senku
No, hang on.
[08:59] Senku
As far as they know, that explosion
could have been from a volcano.
[09:04] Senku
We need to signal them even
more before they leave.
[09:08] Taiju
I see!
[09:10] Yuzuriha
But if Tsukasa-kun is after us...
[09:13] Senku
We'll be doing him the courtesy
of letting him know where we are.
[09:19] Senku
The least logical part of me,
my gut, is talking to me.
[09:23] Senku
If we start a fire now...
[09:26] Senku
Which do I choose? Safety?
[09:29] Senku
The future?
[09:30] Taiju
What do we do, Senku?
[09:32] Taiju
Put it out?
[09:33] Taiju
Or light it?
[09:37] Senku
Light it!
[09:38] Senku
Fire the smoke signal!
[09:53] Senku
We're running out of gunpowder.
[09:55] Senku
Throw in anything that'll burn!
[09:57] Taiju
Hang on! I'll go get some wood!
[10:00] Senku
It's a double-edged smoke signal.
[10:02] Senku
We're letting everyone in the
vicinity know where we are.
[10:05] Senku
If Tsukasa knows about our
plan to make gunpowder...
[10:09] Tsukasa
Senku is trying to make gunpowder.
[10:12] Tsukasa
The shells told me as much.
[10:15] (Flashback) Senku
There are four insanely
useful ways to use it.
[10:20] (Flashback) Senku
Didn't I say three?
[10:22] Tsukasa
Senku hid one because he
thought I could be a threat.
[10:26] Tsukasa
Which means...
[10:28] Tsukasa
The fourth important use for sea shells is
[10:31] Tsukasa
weapons of science.
[10:33] Tsukasa
It's easy to imagine.
[10:34] Tsukasa
For example,
[10:35] Tsukasa
mass production of potassium nitrate,
which is used in gunpowder.
[10:41] Tsukasa
That's it.
[10:42] Tsukasa
Senku was already thinking ahead
[10:44] Tsukasa
to a future in which he'd
use gunpowder to fight me.
[11:12] Senku
"If weapons of science enter the scene,
[11:14] Senku
I won't be the most powerful anymore."
[11:18] Senku
You look like you're about
to throw a tantrum, Tsukasa.
[11:24] Tsukasa
You could put it that way.
[11:28] Tsukasa
If you make weapons of science
and revive the older generations,
[11:33] Tsukasa
they'll begin fighting over
established interests,
[11:36] Tsukasa
and we'll be right back in a tainted world.
[11:40] Tsukasa
I don't mind getting my hands
dirty in order to stop that.
[11:46] Senku
So now you have to kill
Science Man Senku here, huh?
[11:52] Senku
America would be moved to tears
by your merciful death sentence.
[11:56] Tsukasa
Yeah. But first,
[11:58] Tsukasa
would you mind giving me the recipe
for the petrification revival fluid?
[12:08] Senku
Sorry, but I'm not as merciful as you are.
[12:11] Senku
I can only look at things logically.
[12:15] Senku
I don't care one millimeter
what you do with that woman.
[12:19] Senku
There are plenty of females around—
[12:27] Tsukasa
Don't try to negotiate, Senku.
[12:30] Tsukasa
You never buried Yuzuriha.
[12:34] Tsukasa
Your best move would have been
to bury Yuzuriha somewhere
[12:37] Tsukasa
far away while she was petrified.
[12:40] Tsukasa
That way, she'd never be taken hostage.
[12:43] Tsukasa
There's no way you couldn't have
thought of something that even I did.
[12:48] Tsukasa
But you didn't do it.
[12:50] Tsukasa
Was it for Taiju? Or for Yuzuriha?
[12:54] Tsukasa
No, it was for both of them.
[13:01] Tsukasa
You call yourself logical, but you
have friends that are precious to you.
[13:06] Tsukasa
I have plenty of admirers,
but I have no one I'd call precious.
[13:13] Tsukasa
That's why I win, Senku.
[13:18] Yuzuriha
I actually appreciate that.
[13:20] Yuzuriha
Washing my hair is a pain in this world.
[13:30] Yuzuriha
Don't tell him, Senku-kun.
[13:33] Yuzuriha
So long as he doesn't have the
recipe for the revival fluid,
[13:36] Yuzuriha
Tsukasa-kun can't kill you.
[13:43] Yuzuriha
I don't mind.
[13:46] Yuzuriha
But you have to survive so that
you can secure everyone's future.
[14:06] Senku
The revival fluid is a compound
of nitric acid and alcohol.
[14:14] Senku
Filter the miracle water from the cave,
[14:17] Senku
and mix it with alcohol that's been distilled
[14:20] Senku
up to as close to 96% as you can get it.
[14:23] Senku
The ratio is 30% miracle water to 70% alcohol.
[14:26] Senku
If you're off by so much as a few percent,
the reaction won't happen,
[14:30] Senku
so fine-tune it using a
petrified swallow feather.
[14:38] Tsukasa
Thank you, Senku.
[14:42] Tsukasa
I no longer have a reason to let you live.
[14:51] Taiju
This should be enough.
[14:57] Taiju
Three smoke signals!
[15:00] Taiju
They must be responding to the three
shots we fired with the gunpowder!
[15:04] Taiju
There's no mistake!
[15:05] Taiju
There are people!
[15:07] Taiju
Senku!
[15:09] Taiju
Yuzuriha!
[15:17] Kohaku
Three.
[15:27] Tsukasa
If I let you live,
[15:30] Tsukasa
you would let civilization develop.
[15:34] Tsukasa
Will you promise that you won't do that?
[15:39] Senku
What the hell are you talking about?
[15:40] Senku
Why would I ever keep a promise like—
[15:42] Tsukasa
No, you would never lie.
[15:45] Tsukasa
Not to science.
[15:49] Tsukasa
Will you promise here and now, for all
eternity, that you'll abandon science?
[15:59] Tsukasa
If you do, I won't have
to kill you, Senku.
[16:13] (Flashback) Sensei
All right, next is Senku-kun.
[16:16] (Flashback) Senku
I'm going to space.
[16:18] (Flashback) Sensei
An astronaut!
SIGN What I want to become
[16:20] (Flashback) Sensei
That's a great dream.
[16:22] (Flashback) Sensei
Well, when you grow up...
[16:24] (Flashback) Senku
No, I'm going immediately.
[16:29] (Flashback) Senku
Then again, I'm just a kid who doesn't
know the first thing about science.
[16:33] (Flashback) Senku
I'm going to study
[16:36] (Flashback) Senku
every last thing.
[16:39] (Flashback) Senku
I'm going to try everything.
[16:47] (Flashback) Dad
I can't help you.
[16:49] (Flashback) Dad
But, Senku, if you're serious,
[16:53] (Flashback) Dad
you can accomplish anything through
diligent application of science.
SIGN Used Cars
[16:59] (Flashback) Dad
I'm sure Santa Claus will
give you the tools you need.
[17:15] (Flashback) Senku
You can burn things with the point
of light from a magnifying glass.
[17:19] (Flashback) Grampa
What an adorable experiment.
[17:26] (Flashback) Senku
Sand iron and aluminum foil are awesome!
[17:29] (Flashback) Senku
The frying pan is melting
from the thermite reaction.
[17:32] (Flashback) Grampa
Adorable...?
[17:38] (Flashback) Senku
The liquid oxygen for the injector boils off
ten billion percent at a normal temperature,
[17:43] (Flashback) Senku
and it freezes when it's too cold.
[17:45] (Flashback) Senku
I'll have to keep trying with ethanol
for a while until I switch to kerosene.
[18:16] (Flashback) Taiju
What's that?
[18:17] (Flashback) Taiju
It's an ablator.
[18:18] (Flashback) Taiju
The chamber will burn out if I don't use it.
[18:23] (Flashback) Taiju
Hello.
[18:25] (Flashback) Taiju
I need a Raspberry Pi, a transmitter
module, and this thing called a "gyro."
[18:45] (Flashback) Senku
We'll use a good old Yagi
antenna for the receiver.
[18:48] (Flashback) Senku
It's what they'd use for TVs.
[18:57] (Flashback) Taiju
Senku!
[18:58] (Flashback) Taiju
You said you'd try it with a light payload, right?
[19:02] (Flashback) Taiju
I had Ogawa Yuzuriha-san of the crafts
club make us three passengers.
[19:10] (Flashback) Yuzuriha
It's seriously embarrassing,
having a doll of myself.
[19:13] (Flashback) Yuzuriha
What are you even using these for?
[19:57] (Flashback) Senku
It blew up at a really high altitude.
[19:59] (Flashback) Taiju
Failed again?!
[20:02] (Flashback) Senku
Not entirely.
[20:11] (Flashback) Senku
I'm going to space.
[20:14] (Flashback) Senku
I'm going immediately.
[20:17] Senku
You can accomplish anything through
diligent application of science.
[20:25] Tsukasa
Senku, I'd rather not
kill you if I can help it.
[20:31] Tsukasa
I'll ask you again.
[20:34] Tsukasa
Will you promise me, here and now,
that you'll abandon science?
[20:42] Senku
I can't do that.
[20:51] Tsukasa
I thought that would be your answer.
[20:56] Senku
What are you babbling about?
[20:58] Senku
You were going to kill me at some
point, no matter how I'd answered.
[21:03] Senku
To be on the safe side.
[21:05] Tsukasa
Perhaps.
[21:09] Senku
Do it in one blow.
[21:11] Senku
Making me bleed out forever
wouldn't be logical for either of us.
[21:17] Tsukasa
Don't worry.
[21:19] Tsukasa
I'll bust your cervical
nerve in a single blow.
[21:21] Tsukasa
You'll be knocked unconscious
instantly, and then you'll die.
[21:24] Tsukasa
I won't make you suffer.
[21:26] Tsukasa
I promise not to miss.
[21:30] Yuzuriha
Taiju-kun...
[21:34] Taiju
Yuzuriha...
[21:35] Taiju
Senku!
[21:40] Tsukasa
Senku, if we'd met 3,700 years ago...
[21:47] Tsukasa
If we'd met before this planet
became a stone world...
[21:56] Tsukasa
You may have been my first friend.
[22:00] Senku
Maybe.
[22:10] Taiju
Senku!
SIGN Next Episode
SIGN 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.