Previously on Let the experiment begin Akira was given information on how Azazel and Sento met. Meanwhile Akira and Ryu met and interesting tall fellow name Hygami who is known as engine bros and was able to defeat Blood Stalk. What will happen next? You already know.
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Akira was already making some invention

Ryu: He sighs "As usual he's at it again."

Hygami: "What are you talking about?"

Ryu: "When he got broken up he started making weird inventions."

Hygami: "I need an explanation."

Then Ryu explains what happened and how it all started

Hygami: "Ohhh I get it now."

Ryu: "Yep. You know what we gotta help him by finding him the right- no best match."

Hygami: "Nice one.

Ryu: "Thanks."

A long Timeskip

Akira was bored and he just started whistling

Akira: "So this is the boredom of doing nothing. Filler episodes are terrible."

Then Ryu and Hygami approaches Akira

Ryu: "Hey Akira."

Akira: "Yeah?"

Ryu: "We got good news."

Akira: "What is it?"

Hygami: "You're going on a blind date."

Akira: "Why guys can't you see I'm trying to not to date anyone."

Ryu: "Akira I'm sick of your depressed voice your going on that blind weather you like or not or I'll set you on fire."

Akira: He sighs "Fine but you guys owe me."

Hygami: "Yeah sure."

Akira: "So did you told my blind to where we meet?"

Hygami: "At a nearby cafe here take this." He gives Akira around one million yen (which was about 9282 American dollars)

Akira: "Do I have to pay you back?"

Hygami: "Nah keep it."

Akira: "Oh well thanks."

Hygami: "Your welcome."

The next day

Akira was at cafe they told him to go to while Ryu and Hygami became his wingmen by watching from afar with disguises

Akira: He then checked his phone at the time "Hmm I wonder what's taking my blind date so long."

???: "Hey you must be my blind date."

Akira: "Umm if I'm assuming your also my blind date then hi my name is Akira."

Ravel: "My name is Ravel."

Akira: "So Ravel first time doing a blind date?"

Ravel: "Yep two guys say that they know Kamen Rider Build who is looking for someone to love and so I accepted."

Akira: "Yeah also those two guys." He sighs "They're my friends, they're just trying to help me find me someone after my break up with my ex."

Ravel: "Oh so you've had a girlfriend before?"

Akira.: "Well it's hard to explain. Her and I were having a complicated relation."

Ravel: "Is that so?"

Akira: "Yep."

Ravel: "So tell me about yourself."

Akira: "Yeah-" That was when he phone rang "Hold on." He answers it "Hello."

Ryu: "Dude your doing well also FYI remember Riser?"

Akira: "Yeah?"

Ryu: "Yeah that's his sister your currently dating."

Akira: "So you pretty much put me on a "I'm screwed" scenario?"

Ryu: "Yep."

Akira hangs up

Ravel: "Something wrong?"

Akira: "No just my friends that's all."

Ravel: "Oh."

Akira: "Yep."

Ravel: "So back to the topic, tell me a bit more of yourself."

Akira: "For starters like you said I'm Kamen Rider Build."

Ravel: "Basically the guy who just beat up my brother with Cross-Z?"

Akira: "Yep. And assuming you said brother that means that Riser is your brother?"

Ravel: "Mhm. Also I think he doesn't know that I'm going on a date with you."

Akira: "Well I'm screwed."

Ravel: "Pretty much unless we get caught by him. So question what form do you commonly use?"

Akira: "Hard question as most of my forms are good in most situations but if I had to say... either RabbitTank or hawkgatling."

Ravel: "Interesting."

Akira: "Yep. So what's the one thing you like in a relationship?"

Ravel: "Obviously a nice, decent, looking guy who isn't a pervert."

Akira: "Well it's a good thing I'm not a pervert."

Ravel: "Good. Now what do you want in a relationship with a woman?"

Akira: "Getting along, maybe go out on a couple of dates, and maybe but probably just relax."

Ravel: "Wow so about appearance?"

Akira: "To be fair I'm not that into fashion. Plus my taste is mostly wearing black clothing."

Ravel: "Wow that's uh.. good I guess."

Then a few minutes of silence

Ravel & Akira: "Look this is my first time dating someone so please apologize for being awkward." They both said in unison

Akira: "Look it's fine plus I have no idea what to do on a date as I never been on one."

Ravel: "Ditto."

Akira: "Let's get some coffee because honestly it'll be awkward."

Ravel: She nods "Agree."

They both ordered coffee and then talked and walked while holding coffee. Then Ryu and Hygami follows them but tries not to act suspicious

Long Timeskip

It's the afternoon and the two are sitting on a bench at a park

Ravel: "Well I had a great time."

Akira: "Same. I wish we can do this again."

Ravel the suddenly kissed him on the lips which was a surprise for Akira

Akira: Started blushing "W-What was that for?"

Ravel: "What can't I kiss my boyfriend?"

Akira: "Wait so you mean?"

Ravel: "Yep I wanna go on another sometime. Here." She handed him her phone number and two Fullbottles

Akira: "Wait how did-"

Ravel: "Well lets just say I found them."

Akira: "Well then at least that's a convenien-" Then he heard a familiar voice but the voice wasn't a good one

Riser: Appeared behind them "So not only you bloat on your victory against me but you decided to date my sister?!" He grabbed him by the collar

Ravel: "Riser let him go!"

Riser: "Stay out of this!" Then he done the unthinkable and accidentally slapped Ravel

Akira: "Bastard..."

Riser: "Huh-" a Without any reaction Akira headbutted Riser causing him to let go

Akira: "Bastard...!" He pulls out the build driver

Ravel: "Akira stop!"

Riser: "No Ravel let him in fact how about this if you can defeat me then I'll let you see Ravel but if you lose then you're prohibited to seeing her again."

Akira: "So then." He pulls out the Phoenix and robot Fullbottles "Now shall we begin the experiment?" He shakes the Fullbottle, twist the caps, and inserted into the driver

Phoenix! Robot! Best match!

Then Akira twist the crank

Are you ready

Akira: "Henshin!"

Fujimi no Heiki! PhoenixRobo! Yeahhh!

Riser then goes on the attack and setting Akira on fire to which he charges at Riser with a punch and then it became an all out war as Riser just keeps getting up but Akira wasn't giving up

Small Timeskip

Akira had enough mostly due to how long they fought which was around 15 minutes to which Akira just twist the crank

Ready go! Vortex finish!

Then Akira was covered in flame resembling a Phoenix as he continually rams into Riser as he kept dodging but he was slow as Akira rams him one last time and then Riser was on the ground not covered in scratches due to his regeneration ability

Riser: "Tch I can still keep on going!!" His punch was blocked

Akira: "Riser you know how'll it'll end even it's me or cross-z you'll be defeated by two thing."

Riser: "And that's."

Akira: "Your arrogance and since your a devil I can just use some holy water on your pathetic face. But as much as I love to pound you to the ground in the end I won't kill you not only that I can't but I won't."

Riser: "And why's that?"

Akira: "I get that your trying to protect your sister but it's best that you shouldn't worry that often." Then his armor disappears "Besides I'm not trying to go and kill you also your sister is a wonderful person to be around."

Riser: Instead of leaving he shakes his hand "Well then Buil- I mean Akira you proven yourself so lord Riser will allow let you date Ravel but if you ever try to do anything inappropriate to her or deflower her don't be surprise when I come and find you and set you on fire."

Akira: "Hey your not the first person who threaten to set me on fire." Then they both started laughing about it

Akira: "Well I'll see you later Ravel." He started walking back home as Ravel waves back at Akira

Timeskip

When Akira came back home Ryu and Hygami were inside congratulating him on his first successful date

Akira: "Wait how did you enter my house."

Ryu: "Uhhhh..." Ryu set the back door on fire and enters himself in "No comment."

Hygami: "Well Hey at least you didn't died 7/10."

Akira: "And what's that supposed to mean?!"

Hygami: "Uhh.... no comment." Then Ryu and Hygami left his home

Akira: "Weirdos." Then he went to the kitchen to find the back door burned to a crisp "RYUUUUU!!!!!"

To be continued

Next time on Let the experiment begin

Akira: "We have no idea but we have one guy single soo... another filler."

Ryu: "Another filler."

Akira: "Alright now you have a 10 seconds head start."

Ryu: "Why?"

Akira: "FOR SETTING MY DOOR ON FIRE AND FOR BREAKING AND ENTERING." Then he chases Ryu with a chainsaw