E4 - Fire the Smoke Signal

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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.