Previously on Let the experiment begin. Akira wanted taking to Sirzechs about his unknown family that was until Night Rouge told him his real name happens to be Kiriya. What will happen next? The start of season two... (Or do you thought)
————————————————————————

Akira and Ryu were in class just as usual and were talking

Akira: "So yeah apparently my real last name is Kiriya."

Ryu: "Wait why would you believe in Night Rouge?!" He caused the whole classroom to go silence

Akira wrote: don't say that around idiot we'll talk after school it's better this way

Ryu: "Tch fine."

Akira: Talking to himself "My last name Kiriya?"

Timeskip

Class was over and students were either going to their clubs or walking back home

Ryu: "So why would you believe in Night Rouge?"

Akira: "I don't believe him but he doesn't look like the type of person to lie."

Ryu: "Well it's best that I should tell you something."

Akira: "What is it?"

Ryu: "It's this." He pulls out the Sclash driver with the dragon jelly

Akira: "What are those?"

Ryu: "I don't know but apparently this is a Sclash driver it came with this thing called Dragon jelly."

Akira: "Was there a note about who send it to you?"

Ryu: "No."

Akira: "Well I want to show you something to."

Ryu: "What is it?"

Akira: "This." He shows the hazard trigger

Ryu: "What is that?!"

Akira: "It's called the hazard tigger it can increase my hazard level whenever I transformed but there are side effects."

Ryu: "Woah we must try it out."

Akira: "I think sure."

Meanwhile

???: "Tchh. Build!!!" The mysterious person pulls out the Sclash driver with the robot jelly

Back with Akira and Ryu

Akira: "Well I should get going also by the way dude I think Akeno is falling for you."

Ryu: "W-What?!"

Akira: "Dude just because I was gone doesn't mean that I didn't see the whole thing." He pulls out a mechanical hawk that has camera for eyes

Ryu: "Why Bro?!"

Akira: "Hey either you make your move with her or I'll just go up to her and tell who is Cross-Z."

Ryu: "Oh well two can play that game."

Akira: "Pfft oh please I don't think I have someone who has some interest in me."

Ryu: With a smirk "Ok then flashback."

Akira: "What the-"

Flashback

While at the aftermath of the wedding Ryu was about to leave until he overheard a conversation

Tsubaki: "Lady Sona what did you think of the fight?"

Sona: "Honestly I think Cross-Z was acting reckless like a bull."

Ryu was angry but still continued to listen

Tsubaki: "What about the other one. Build, I think that was his name."

Sona: She only blushed for a brief moment "B-build if I were to say something about him he's more of the genius."

Tsubaki: "Oh what was that? Did you stuttered and a brief blushing?"

Sona: "What? That's nothing Build is probably just some random person who only got lucky with Cross-Z."

End of flashback

Akira was laughing after the small insult on Ryu

Ryu: "Bastard! I will set the b-"

Akira: "Don't say that this is not the moment to swear nor any moment."

Ryu: Groans and sighs "Fine but remember she has feeling towards you so if I'm going down you're going down with me."

Akira: "Look you may have been trained by dragons and received a build and Sclash driver remember who gave you the power to become Cross-Z."

Ryu: "Tch ok fine I say nothing to Sona and you say nothing to Akeno. Deal?"

Akira: "Deal." He shakes his hands

Another Timeskip

Ryu and Akira decided to train with Akira in GorillaMond and Ryu using Cross-Z dragon though not using the Sclash driver

Akira: "Ok so with that we should be able to-"

Suddenly Blood Stalk appeared watching them train

Ryu: "Blood Stalk?!"

Blood Stalk: "Relax I'm not here for you, I'm here for him." He points at Akira

Akira: "What do you want?"

Blood Stalk: "I've seen what you and Cross-Z can do so here." He gives him back his rabbit and Tank Fullbottles

Akira: "Why?! Also tell me do you know my father?!"

Blood Stalk: "One I wanted to see how powerful you're getting and two I can't tell you yet." He disappears

Ryu: "Wow well hey you have something special about you."

Akira: "Yeah." They were about to train but however an unknown person appears

???: "I shall defeat you."

Ryu: "Who are you?"

Grease: "I can't reveal my identity but I am Kamen Rider Grease. And I'm here only to take down Build so stay out of the way Cross-Z

Akira: "And why me to be exact?"

Grease: "Tch don't get cocky!!" He started to attack Akira and his attacks on him were successful and powerful, powerful enough to send him flying

Akira: "Gah!!!"

Ryu: "Hey Build!"

Akira: "Huh?"

Ryu: "We gotta go all out!"

He ran off somewhere else to hide for now

Grease: "And with that he's a coward."

Akira knew what he's doing so he proceeds to attack Grease but his attacks weren't strong

Meanwhile

Ryu was behind trees and was holding onto the Sclash driver

Ryu: "I gotta be a friend and save his behind." He removed the build driver and put on the Sclash driver.

Sclash driver

Then he twist the cap and insert the dragon jelly onto the Sclash driver

Dragon Jelly!

Ryu: "Henshin!" He then pull down on the wrench of the driver which caused the dragon jelly to be squeezed and blue jelly into a tank on the driver while electricity were shocking him

Ryu: "Gah!!" Then he was in a cylinder tank with blue jelly substance to where it started turning into an armor and then the blue jelly coming out of the head creating a this

Tsubureru! Nagareru! Afurederu! Dragon in Cross-Z Charge! Buraa!

(Crush! Flow! Overflow! Dragon in Cross-Z Charge! Buraa)

Ryu then charges back into the fight with a lot of anger in him

Grease was having a hard time trying to block him as Ryu pulls out the twin breaker

Grease: "Tch get out of my way!!"

Ryu: "Build use it now!"

Akira: "I don't know if I'm ready to admit it." He was carrying the black hazard trigger

Ryu: "Hey Build stop talking to yourself and use it!"

Akira: "Right!"

To be continued

Next time on Let the experiment begin

Akira: "I will surpass to become stronger!"

Grease: "Build once you're defeated I'll be killing you."

Akira: "Gah!!!!"