Previously on Let the experiment begin. Akira gave a letter to Ryu to which it was about how Blood Stalk challenge him to a fight in the end he lost now then what will happen next?
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Ryu was back at his place. How he got there, well basically Akeno and Akira founded him on the ground covered in bruises so in there best option they took him home

Akira & Akeno: "You idiot!"

Ryu: "Hey don't blame me."

Akira: "Bro you wanna know what I dealt with?"

Ryu: "No what?"

Akira: "Ok then. While you left the fight Blood Stalk Akeno was getting worried about you so she try calling you and nothing then she went up to me and ask do I know where you were. I didn't know until we found you covered in bruises. So great job reckless dragon."

Ryu: "Oh screw you, you would have done the same."

Akira: "I'm ashamed of you. Going into battle recklessly."

Akira: "I gotta go you two do whatever it is you do. I have to save something bye bye." He left his place and drove back home

Ryu sighs

Akeno: "What's wrong?"

Ryu: "It's nothing."

Akeno: "Come on you can tell me."

Ryu: "Well it's just that I think I might be having some problems with dealing with people who would harm me or others or calling me or Akira weak."

Akeno: "Well Hey at least you're here in one piece with a couple of bruises."

Ryu: "Yeah."

Akeno: "Ok then now time for bed young man."

Ryu: "You're not my mom."

Akeno: "You're not my father but I'll still call you daddy~"

Ryu: "I am confused I'm going to bed. Good night."

Timeskip

Akira was hanging out with Sona again

Sona: Noticed something was wrong with Akira "Hey what's wrong?"

Akira: "It's nothing." He was lying as there was something he wanted to tell to her

Sona: "Hey you can tell me."

Akira: "Well let's just say it involves a fallen angel, a dvd, and my father."

Sona: "What?"

Akira: "Long story short I defeated a fallen angel who knew about my father and apparently some alternate universe he defeated an extraterrestrial life form name Evolto. His name is Sento Kiryu."

Sona: "Interesting. Did the fallen angel have a name?"

Akira: "Yeah Azazel."

Sona: "Azazel?!"

Akira: "Yeah why what's the problem."

Sona then removed his shirt to see if he received any major injuries but no injuries were there

Sona: She Sighs "Thank goodness."

Akira: He put back on his shirt "Umm are you okay?"

Sona: "Look I'm not comfortable of you being around that man."

Akira: "Why is it because he's a fallen angel?"

Sona: "Yes."

Akira: "Wow ok then I won't try to disobey you even though I ain't your servant but if I do see him... yeah I'll know what to do."

Sona: "Good."

Akira then left the student council room but after a few steps Saji approached him

Saji: "Hey can we talk for a moment Kamen Rider Build."

Akira was shocked mostly due to only a few people knowing that he's Build and Saji wasn't one of them

Akira: "How did you know I was Kamen Rider Build?"

Saji: "Lucky guess?"

Akira: "Bull crap. Also I have something to ask you."

Saji: "Yeah?"

Akira: "Remember this?" He pulls out the robot jelly though it was a fake but it looked real

Saji: "What?! How did you get that?!"

Akira: "So care to explain Kamen Rider Grease?" He crushes the fake robot jelly

Saji: "Bastard!" He pulls out the Sclash Driver with the real robot jelly and twist the cap and inserted into the Sclash driver

Robot Jelly!

He pointed at him and then up then he pulls on the wrench of the Sclash Driver

Saji: "Henshin." Then he was in a cylinder tank filled with gold jelly and then appears in a armor while gold jelly started gushing out of his head and then forms the entire set that Akira remember

Tsubureru! Nagareru! Afurederu! Robot in Grease! Buraa!

(Crush! Flow! Overflow! Robot in grease! Buraa)

Akira wasn't even giving a crap in fact he didn't showed fear

Saji: "Why aren't you cowering in fear?!"

Akira: "Saji you're not the first Kamen Rider I fought so basically seeing you is like having to eat the same meal everyday, it gets boring. Now what did you wanted to do to me?"

Saji: "I am gonna defeat and kill you. Now hurry up and transform now!!"

Akira: "Ooh so scared, yeah no."

Saji: "Why cat got your tongue?"

Akira: "No because reminder devil boy if something were to happen to me I always make sure I have a plan. Now tell me why do you wish to kill me?"

Saji: "For Sona..."

Akira: "Oh and what you have feelings for her?"

That was when Saji grabbed him by the collar

Saji: "Bastard you took my opportunity to confess to her."

Akira: "Hey I'm pretty sure there are plenty fishes in the sea. Also I think it's best you don't try to kill me."

Saji: "Give me one reason why?"

Akira: "I can give you three reasons. One since me and Sona are hanging out we are starting to get into a relation. Two if she notice that I left and she found out I died well she'll probably reincarnate me as a devil and I'll tell her everything. Three you don't have the balls to kill me."

Then his armor disappears and lets go of Akira

Saji: "...Tomorrow we will fight one on one."

Akira: "Ok then." They both went there separate ways

To be continued

Next time on Let the experiment begin

Ryu: "Well looks like I heard about fighting?"

Saji: "I never thought you would show up."

Akira: "Come on lets just end this now and become friends!"

Akira: "If that's how you want to play then." He pulls out the hazard trigger