Previously on Let the experiment begin Ryu was doing some self-calm training with a monk, Native American, and a nomad meanwhile Akira was training with Blood Stalk (aka Sento) to train with using his anger. Kinda like Akira is yin to Ryu being yang. What will happen next?
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A week has gone by and both Akira and Ryu's training were completed. Ryu managed to get some calmness into him while Akira learned to fight with anger and as a added bonus he is carrying a suitcase full of Fullbottles

Akira: "A week gone by I will defeat Saji."

Ryu: Came up to him in a calm voice "Dude why are so angry plus what's inside that suitcase?"

Akira: "Not answering."

Then when he arrives where Saji wants to meet Akira where it was a flat arena with two flags. One representing Akira and one for Saji

Saji: "Finally you arrived."

Akira: "Yeah."

Saji: "It's time to see whose the strongest."

Akira: "Saji your fate was already sealed."

Saji: He started laughing "Oh whatever tricks you got I'll just break through them."

Akira: "Alright then but to see who'll be victorious there will some way to show who wins."

Saji: "Explain."

Akira: "If the opponent is unable to battle, surrenders, or force disengagement of the Rider system."

Saji: "Tch that'll be easy." Then he and Akira pulled out thier drivers and Akira shakes the rabbit and tank Fullbottles, twist the caps, and insert it into his driver

Rabbit! Tank! Best match!

Akira started twisting the crank

Are you ready!

Akira: "Henshin"

Hagane no Moonsault! RabbitTank! Yeahhh!

Then Saji twist the cap on robot jelly and insert into the Sclash driver

Robot jelly!

Then he pulls the wrench

Saji: "Henshin."

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

Then the two charge at each other and then punch one another

Small Timeskip

The two kept on fighting and then Akira pulled out the rose and helicopter Fullbottle

Rose! Helicopter! Best match!

Akira twist the crank!

Are you ready!

Akira: "Build up!"

Jounetsu no Senpūki! RoseCopter! Yeahhh!

Then Akira whips Saji and kept using the propeller as a sword

Ryu was imaging on the rose whip and Akeno using it. (A/N: hehehe)

Then Akira changes bottles by using tiger and ufo Fullbottle

Tora! UFO! Best match!

Akira twist the crank

Are you ready!

Akira: "Build up!"

Mikakunin Jungle Hunter! ToraUFO! Yeahhh!

Then Akira moved fast to scratch Saji and then suddenly he was on top of a ufo made out of energy and kept attacking fast. Then Saji was about to prepare for an attack until Akira pulls out whale and jet Fullbottle

Kujira! Jet! Best match!

And again he twist the crank

Are you ready

Akira: "Build up."

Amakakeru Big Wave! KujiraJet! Yeahhh!

Beam mode!

Saji then shot at Akira but then Akira somehow smashed the ground causing a water blocking the attack and splashed at Saji causing him to be sent up into the sky while Akira swapped Fullbottles again

Kirin! Senpuki! Best match!

Akira twist the crank!

Are you ready!

Akira: "Build up."

Arashi o Yobu Kyotō! Kirincyclone yeahh!

Then Akira flew up and twist the crank

Ready go! Vortex finish

Then Saji was on the ground

Saji: "Gah! Revenge! Payback!" Then he charges at Akira going toe to toe against him

Saji: "Love! Passion! Beauty! Now be gone!" He pulled down on the wrench

Scrap finish!

Then he punched him with a gold jelly fist causing Akira to fall down

Another small Timeskip

Akira was in rabbit tank sparkling and was using the drill crusher and he inserted into the drill crusher while twisting the crank

Ready go! Vortex break! Sparkling finish

Akira not only have a giraffe binding Saji but as well bubbles started going towards Saji and was dealing damage. But after all of that he was still standing

Saji: "This is what I'm fighting for!"

Then both Akira and Saji does a kick which resulted with a grease and sparkling kick towards one another but, resulted in Saji standing and Akira getting up

Then Akira was holding the hazard trigger which caused Ryu to get worried

Akira: "Should I use it? Am I able to control myself?"

Ryu: "AKIRA DON'T USE THE HAZARD TRIGGER!!"

Akira: "I have no choice." Then he pressed the button on the hazard trigger

Hazard on!

Then Akira insert it to the driver and also replaced the sparkling Fullbottle with the rabbit and tank Fullbottle

Rabbit! Tank! Super best match!

Akira started twisting the crank

Gata Gata Gotton! Zuttan Zutan!

Are you ready

Akira: "Build up!"

Uncontrollable switch! Black hazard! Yabei!

Meanwhile Blood Stalk was watching from afar

Blood Stalk: "Come on Akira use what I have trained you for."

Then Akira has the advantage and proceeds to do rapid punches on Saji

Another Timeskip

As the sun went down the night was up and these two kept fighting. During the fight Akira felt the same feeling every time he uses the hazard trigger but he tries to stop himself but he was already in berserk mode and attacks with stronger punches but when he fights he dodges Saji's attack

Taka! Gatling! Super best match!

Uncontrollable switch! Black hazard! Yabei!

Saji jumps and was going for a drop kick but Akira punches him away. Then Akira presses the button on the hazard trigger again and twist the crank

Max hazard on!

Gata Gata Gotton! Zuttan Zutan!

Ready go! Overflow!

Akira then flies and then shoots Saji with the hawk gatlinger

Saji: "Gah!!" He was then kicked into the air which caused Akira to pull the crank again

Gata Gata Gotton! Zuttan Zutan!

Ready go! Hazard finish!

Then a dark sphere surrounded Saji while Akira shot Saji causing him to fall and a shock of electricity to shock him and his armor disappears

Ryu: "By Rider system disablement. Akira wins!"

When it was over Akira grabs Saji

Saji: "Please let me go... you won is that enough for you?! What is it you want? Sona?! You can have her!"

Akira: "...No I just want to see that pathetic face of yours suffer from me." Then he use the hawk gatlinger on Saji by shooting him multiple times which lead to him have holes in his body but not enough to kill him

Saji: "Gah!!!!"

Akira removed the hazard trigger and the rabbit and Tank Fullbottles which lead to him to get on one knee from the amount of energy he wasted

Akira: Gets up on his knees "Think of it as my way of showing whose the strongest." Then he used the haw gatlinger to shoot the Sitri clan flag

To be continued

Akira: "It's over now but..."

Ryu: "Dude you changed..." Walks away from him

Azazel: "I want to show you my next form"