With the immense power of Pandora's Box in his possession,
the extraterrestrial entity Evolt has begun to take over the country.
Having regained his memories of being Katsuragi Takumi,
Kamen Rider Build aka Kiryuu Sento heads to Hokuto in order to learn about the Lost Bottles,
which Evolt is collecting...
I feel like my characterization is odd lately.
You just noticed?
But what's the cause?
Is it because I can't buy a train ticket on my own?
That I refuse to eat green peppers?
Or because I can't sleep without a light on?!
You're such a kid!
Now, will you be wearing another novelty t-shirt in Episode 41?
I'll use them to create a new world!
You can help, if you're interested.
Don't be stupid.
GREAT! GENIUS!
YEAH! YEAH! YEAH! YEAH!
ARE YOU READY?
Transform!
BUILD GENIUS!
AWESOME!
Now, let's begin the experiment.
REALLY AWESOME!
You sure are bursting with confidence...
But can you beat me in my complete form?
OVER THE EVOLUTION!
I've got the winning formula.
ONE SIDE!
What?!
ALL SIDES!
READY, GO!
GENIUS FINISH!
I'll defeat you before you can take your complete form...
That is the winning formula.
What is this?
This feeling...
I see...
That must be it!
Sento!
You really are terrific!
I never would've guessed that bottle would have a power like this!
Out of respect for your invention...
I'm going to leave the bottles for another time.
Ciao!
Did you find anything?
I met with Reika.
It's just like you thought.
Your dad...
He's alive.
Pandora's Box, which contains enough energy to destroy the Earth, has finally been opened!
Standing up to Evolt, the extraterrestrial life form that has gained its power,
are the Kamen Riders!
I'm going to keep walking on tonight
Moving on straight ahead
Leaving only a single set of footprints ahead of me
It seems so vast, but I get the feeling you're out there
Waiting for me somewhere
With a smile that never fades
There you will...
Be the one, be the one
All right!
Who'll never give up on the Earth's future
Be the light, be the light
All right!
You can be stronger
Love will never lose!
Helping, saving, and embracing
Touching our hearts so that it can reach out
Be the one, be the light
Send this message and let it ring out!
The Truth Behind Best Matches
I can't believe Sento's dad is alive...
How did you figure it out, anyway?
I wasn't sure.
But his body was never found, and something has been bothering me for a long time.
He was as close as possible to the flash from Pandora's Box,
so why would he kill himself?
It's true that the light puts you in an aggressive state of mind.
The kind of thing that'd actively keep you from suicide, even.
The Next Level of Frontin'
Beardo...
What, did you want some too, potato farmer?
Rejected!
Rejected how?
You're banned! Get out!
What? But I...
You people are all so...
Try again, beardo.
I think Sento's dad was using Reika's smuggling boat
to keep the fact he was alive a secret.
But why did he fake his own suicide?
Without telling his family...
Reika didn't know, either.
But...
She was told to give this to anyone who showed up saying that they knew his son.
It's got a lot of specifics on the Rider System.
Dad was the one who originally designed it by using the Evol Driver as a basis, after all.
What the hell are you doing back here, man?
Whoa, hold up! Stop!
I have arrived.
Don't give me that "I have arrived" crap.
And what's with that outfit? And that thing you're doing?
It says something about Best Matches, too.
Seriously? What's it say about them?
Sheesh!
Right now, the Lost Bottles are more important.
Yeah, you've got a point.
Wait, why bring it up then?!
Dad was the one who came up with them,
and it seems they have a purpose beyond just causing heightened aggression.
What's that supposed to be?
It says "when ten of the blackened bottles are gathered,
a phenomenon that defies our understanding of physical laws will occur."
Beyond physics...?
So, like... something really bad is gonna happen, right?
That'd be the stupid way of putting it, yes.
What're you laughing at?!
That's better.
But Evolt's destroyed countless planets in a flash already...
Why would he spend a whole decade on Earth?
Good point...
Even if he did need to regain his powers,
he could've destroyed it much sooner, if that was what he really wanted.
Hey...
Hey, people!
Listen!
Let's review what Evolt has done.
He first arrived to Earth ten years ago, to pursue the DNA that became part of Banjou.
Yeah, by possessing Misora's dad.
But he wasn't able to open the Box, and that's when the Sky Wall Disaster happened, right?
After that, Evolt disappeared from the hospital he was being held in,
and he had Sento's dad repair the Evol Driver.
Then he disappeared...
Until he suddenly appeared in a Faust hideout.
Where was he? What was he doing?
I couldn't say...
But this is when his scheming really began.
Evolt, as Stalk, sent a bunch of Smashes after us.
In order to get Misora to purify the bottles.
It's impressive that you guys were able to fight him without any power-up items.
Compared to Night Rogue...
I did not lose.
Unless you count those times against Stalk!
I did not lose!
No one cares!
Well, we were lucky to take down so many Smashes.
Y'know, now that I think about it,
after Sento and Banjou met, weren't all of the Smashes
people with connections to the two of you?
There was Banjou's girlfriend, and Reika, who knew Sento's dad...
Now that you mention it...
There's also Nabeshima, who framed Banjou,
that roommate of Satou Tarou, whose face was swapped with Katsuragi Takumi's,
Sento's mom, Sento's co-workers,
and then last was Sawa.
You're right, they were all connected to us.
Hey beardo, you know anything about that?
You were making the Smashes in Faust, right?
Shut up, potato farmer.
That was Stalk's department, so I have no clue.
You sure he wasn't just gaslighting you?
That's not true! I'm positive!
Yeah, okay, whatever!
Damn, you're intense...
Stalk ended up being the owner...
Hang on.
If I had married Miitan back then,
my wife would've been a Martian,
and my dad-in-law would've been possessed by some kinda alien?
Talk about a complicated family situation!
I am 100% sure that is never going to happen.
Wha...
How can you hear my inner voice?!
Because you were yelling! At full volume!
And then war broke out between the three nations.
Hokuto invaded, there was the proxy battle,
Seito occupied Hokuto, and then Nanba Heavy Industries took over Seito.
Stalk was working behind the scenes the whole time.
Evolt started the war to get my Hazard Level raised
and force Sento to improve the Rider System a bunch, right?
Yeah. All so he could obtain the power of Pandora's Box...
I hate to admit it, but his plan worked perfectly.
And that brings us to Kamen Rider Evol.
He was able to used the fixed Evol Driver to reach Phase 1.
He took my body over, and by absorbing the Evolt DNA I had he got to Phase 2.
And that's when he opened Pandora's Box.
I figured beardo would've been more handy than he ended up being!
There was a perfect setup for you to avenge your old man!
I was a little under the weather at the time...
Well, that's obviously a lie.
You lost because you're weak.
No! I did not lose!
Seriously, no one cares!
And after Evolt possessed Sento, he got to Phase 3.
Sento with white hair was pretty fresh.
He turned back pretty fast, though.
That's our protagonist!
That's enough meta-commentary, okay?
Anyway, at Phase 4 he was in his complete form.
I don't really remember this part, I was Katsuragi at that time.
What was Evolt like?
Hella strong.
Crazy strong.
But I did not lose!
I was a fool to ask you guys.
The End
Well, that didn't serve much of a purpose.
No, I wouldn't say that.
I just remembered there was one Smash subject completely unrelated to us...
Who's that?
The first man to ever be turned into one.
But now, I think there must be some sort of hidden connection...
I'll look into that, then.
Be careful.
Okay. I'll go now.
Something else bothers me...
That time period between his escape and his appearance in the Faust hideout.
That must've been when he discovered this physics-defying phenomenon I read about.
But what could it be...?
Six more to go...
Remember what I said about Best Matches?
Isurugi's memories have a lot to do with it.
Rabbits and tanks, hawks and gatling guns...
Love and destruction.
The Best Matches were based on his memories with you.
What do you mean?
The 60 bottles from Pandora's Box are based on elements from this planet...
So, I poked around in Isurugi's brain.
"Name thirty things you like."
He responded with things that his daughter liked.
Rabbits, pandas, hedgehogs...
Then I asked for things that could take their lives.
At first it was fierce stuff like tanks and gatling guns,
but eventually he came up with nonsense like erasers and comics.
He probably wanted to protect the things his daughter cared about.
Even when I pressed the issue, he just kept giving weird answers.
That was the first time I ever encountered human emotions.
It made me ponder how strange and foolish they are.
I think he really wanted to protect the things you cared about.
It's so stupid... that he even bothered...
When I...
I couldn't even tell he was replaced...
I'm so sorry, Dad...
Joy, suffering, rage, shock...
Human emotions have all just been performative mimicry for me.
Except...
From that moment...
I could feel human emotions within me!
It's the most fun I've ever had!
The subject's name is Shimizu Kyoichi.
He was one of your dad's students...
They came into contact at university,
and he was missing for a few years before he showed up as a Smash.
Right now he's living and working at a friend's bar.
I already made contact.
This is where you'll meet.
How'd you get it done so fast?
You're... better off not knowing.
Katsuragi Takumi's friends have contacted me.
I understand. I'll head there now.
Why do you want to find Dad?
It's been ten years.
What's the point of contacting him now?
I still find myself wondering...
Did he do the right thing, in creating the Rider System?
It occurred to me while I was talking to Misora about Best Matches.
I think when Dad saw Evolt playing with human emotions,
he decided to use those same emotions to bring him down.
That's why he created the Rider System,
which causes Hazard Levels to rise in response to emotions...
Are you Shimizu?
No way!
GREAT! GENIUS!
ALL YEAH!
YEAH! YEAH! YEAH! YEAH!
ARE YOU READY?
Transform!
THE TOTALLY FLAWLESS BOTTLE BRAINIAC!
BUILD GENIUS!
AWESOME!
REALLY AWESOME!
I have to beat you, or he'll kill me!
He'll kill me!
I will save you!
ONE SIDE!
I've got the winning formula!
READY, GO!
GENIUS ATTACK!
ONE SIDE!
FLIPSIDE!
ALL SIDES!
READY, GO!
GENIUS FINISH!
I've neutralized the Nebula Gas in your body.
It's alright now.
Can you tell me where my father is?
I was Professor Katsuragi's assistant...
He's gathering the Lost Bottles to build the black Pandora Panel...
Shimizu!
Aww, just after you went to the trouble of saving him...
Evolt...
Why would you do that?!
Well, I've got genuine emotions now,
and that means seeing you pissed off genuinely tickles me pink.
How dare you...!
READY, GO!
BLACK HOLE FINISH!
CIAO!
These newfound feelings have revealed something to me...
It is so easy to manipulate human emotions.
I'm going to use these bottles your old man has created to turn you into a Lost Smash.
And the man who stands for love and peace will destroy the world!
What?!
The essence was neutralized?!
My father created those demonic bottles
because he believed that justice would win in the end.
He would never bow before someone who toys with people like you!
And whatever you destroy, I can rebuild!
With the power my father created!
ONE SIDE!
FLIPSIDE!
ALL SIDES!
READY, GO!
GENIUS FINISH!
Wh-what?!
My defense was perfect... and still!
What is this feeling?!
How can a pathetic creature like you beat me?!
His Hazard Level increased with his rage...
Okay, then. I'll leave you for last.
That way I can snuff out every last hope of yours
and give you a taste of ultimate despair!
That was pretty emotional of you.
Just a bit of sport.
We need to move up the timetable...
Professor Katsuragi.
Kamen Rider Build!
N
E
X
T
You know where Dad is, don't you?!
The father who designed Build...
Do you still believe in him?
The father who designed Build...
Sold his soul to the devil
You were unable to fulfill your father's ambitions!
Sold his soul to the devil
That's the way.
Legacy of Doubt
Another Build...?