Akira: "Last time on Let the experiment begin 2: Heroes reunited after regaining the memories of Kamen Rider Rouge and Kamen Rider Grease Saji and Azazel we had to deal with Destroyer an entity who is the opposite of me."

Destroyer: "All I want is destruction."

Akira: "Oh hey Destroyer how's it going?"

Destroyer: "Shut it i'll be the one to destroy everything you loved. Now then what will happen next?

Ryu: "Hey that's my schtick plus it'll be a relaxing chapter."

Destroyer: "Yeah right."
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As it starts off with Ryu and Akira in the underworld at a performance which involves the oppai dragon... at that point the author quits and then both Woz and Tsukasa started writing the rest of the story but for them it really didn't mattered so basically back to the story Akira and Ryu were watching the performance

Akira: "...Yeah i'm out." Then he left as unbeknownst Destroyer was watching it and he also left mostly due to him hating it

Destroyer: "Well well if it isn't me."

Akira: "Wait you are...Destroyer?"

Destroyer: "Yep." Then he was holding the Transteam gun "I would kill you but let's just talk."

Akira: "...Meh why not." Then the two started walking while talking as Akira's Springer hops on his shoulder as he puts on his driver "So then care to explain how and why you got here?"

Destroyer: "Basically I managed to create something that allows me to travel to the human world to the underworld. I only got here because I was bored."

Akira: "Of course." Then the two were at a open field where mostly devils were walking around

Destroyer: "Now shall I conduct the experiment on the experiment?" Then he inserts the bottle onto his Transteam gun

Rabbit!

Destroyer: "Mistify." Then he press the trigger as black smoke surrounds him

Mist match! Ra-Rabbit...Rabbit... Fire!

Destroyer: "The formula for disaster has been set."

Akira: "What happened to the love hopper?"

Destroyer: "Threw it away it give no special features the colors are awful. Now then..." Then he started fighting as Akira kept dodging "Come on fight me like a warrior." Then Akira pulls out the rabbit bottle as he shakes it

Akira: "Now shall we begin the experiment?" Then he twist the cap and insert the bottle onto Springer

Hop!

Then he insert Springer onto his driver

Springer!

Then he twist the crank

Are you ready!

Akira: "Henshin!"

Mirainimukatte hoppu! Supuringā! Yeah!

Akira: "Kamen Rider Springer. I'll hop my way towards for my memories and to bring back everyone I knew." Then the two started fighting as Akira and Destroyer were fighting as then devils were watching them fight each other

Destroyer: "Oh look we attracted a crowd but it's time for the underworld to fear me!" Then he used the Transteam gun to fire a great blast of energy causing a big building to be destroyed and for the top part to fall and it would be fine until that was when that there were a family that were about to be crushed but Akira was able to move fast enough to save the family as Destroyer vanished from a black smoke

Akira: He sighs "That was almost terrible but at least I saved a family..." Then the devils were clapping and cheering for them and that was when a reporter were about to talk to him but Akira ran but not before he left a few words "For those who don't know me I used to be call Kamen Rider Build but now I go by another name... and that's Kamen Rider Springer. I'll hop my way towards for my memories and to bring back everyone I knew." Then he hops his way out of the crowd by jumping away from the situation

The next day

As class were over Akira told Ryu why he left and about what happened yesterday

Ryu: "EH?! For real?!"

Akira: "Yeah now most people in the underworld now know the introduction of Kamen Rider Springer."

Ryu: "Are you insane?!"

Akira: "Hey it's not like everybody there knows my identity."

Ryu: "Yeah but sti-" Then that was Ryu notice a familiar person who was familiar

Ryu: "..." Then Ryu grabs Akira and drags him towards that person to which it was Ravel

Akira: "Hey dude let go of me! For god's sake!"

Ryu: "No you two were the best match that pretty much started and then birth of a new Kamen Rider."

Ravel: At that moment she was confused "Umm can I help you?"

Ryu: "Yeah-" Then Akira covered his mouth as he opened a window

Akira: "Ryu I'm sorry."

Ryu: "Sorry for wha- AHHH!!" He fell out of the window by Akira kicking him off the window

Akira: "I'm not you were just weird!" He sighs

Ravel: "Did you just?"

Akira: "Yes he could be annoying and less intelligent."

Ravel: "Isn't that quite harsh?"

Akira: "Yeah but honestly he's fine. See." Than they see Ryu getting up

Ryu: "I forgive you! Plus you two are a best match!"

Akira: "...RYU FOR GOD'S SAKE WE HAVE NO IDEA WHAT YOU'RE TALKING ABOUT!" Then he clears his voice "Sorry about that. Here take this as a apology gift." Then he hands her the Phoenix Charge

Ravel: "Thanks I guess?" Then the two went their separate ways

Later

Saji, Hygami, Itsuki, Ryu, Azazel, and Akira are back at the warehouse and were coming up with a plan

Akira: "Ok so here's a plan I came up with. Saji you'll go after Kazumi, Azazel after Gentoku, Ryu after Ryuga, and me after Sento."

Azazel: "Sounds a bit hard for all of us since we have no idea where they are."

Akira: "Remember... i'm the Genius who can just do this." Than a bunch of mechanical pets appeared a crocodile, robot, and a tank

Hygami: "WHAT THE HELL!? Tell me that tank isn't loaded."

Akira: "Not really..." Then he whistles his way

Ryu: "So how are these gonna help us with finding them."

Akira: "Hold on." Then he takes the crocodile crack bottle and insert it onto the crocodile pet causing it's directive to find Gentoku, then he did the same for the robot with the robot bottle and the tank pet with the tank bottle but he then inserts the rabbit bottle for Springier. As for cross-z charge Akira just reprogrammed it to find Ryuga "Now there, go pets find them also if you get caught umm just do stuff." Then they went to find their target "What are you waiting for go on and follow them!" Then they agree as they follow the pets though Akira had the slowest as he has the tank and it took him about ten boring minutes

A/N: "Another drawing by me again."

https://youtu.be/uqO4JMSYYdI

Akira was walking around as the tank and Springer made a complete stop as they found the target aka Sento who is on a date with Rossweisee

Akira: "...No comment. Now then time for something-" Then suddenly Destroyer and Killbus appeared in their armor with an army of smash clones "Ok now that's way too much of a coincidence." Then the smash clones started attacking "Alright then." Then he removes the rabbit bottle and place it onto the tank's turret as he place the build driver on top of the tank as it then went up to Sento in a slow movement

Sento: "What the?!" Then he picks up the tank which then he sees Akira

Akira: "Just grab the build driver and the bottles, put on the driver,  and then insert the bottles onto the driver, twist the crank, and say henshin!"

Sento: "What?!"

Akira: "Just do it!" Then he had to fight off some of the smash clones

Sento: "Ok." Then he does what Akira told him to do

Rabbit! Tank! Best match!

Then Sento twist the crank

Are you ready!

Sento: "Henshin!"

Hagane no Moonsault! RabbitTank! Yeahhh!

Then Sento regained his memories and Akira regained another part of his memories

Sento: "The rules for victory have been set!" Then he started fighting the smash clones

Killbus: "All right time for some true mayhem."

Destroyer: "Yeah!" Then the two started fighting Sento as Akira pulls out the FullFull bottle as he shakes it for Rabbit as he twist the cap

Rabbit!

Than Akira pulls out the build driver and the hazard trigger as he inserts the trigger and the bottles

Rabbit and Rabbit!

Then he twist the crank

Are you ready?

Akira: "Henshin."

Overflow! Kurenai no Speedy Jumper! RabbitRabbit! Yabei! Haei!

Sento: "Huh?"

Akira: "HAH!" Then he started fighting Destroyer as the two were different in power as now Destroyer had the advantage power wise and so Akira had to take care of the smash clones which then Akira and Sento collided with each other

Sento: "Wow. Hey son what's going on?"

Akira: "Explanation later. For now we'll take care of these-" Then suddenly Kazumi, Gentoku, and Ryuga appears

Sento: "Alright!"

Robot grease!

Wake up! Cross-z Dragon!

Crocodile!

Ryuga, Kazumi, Gentoku: "Henshin!"

Wake up burning! Get Cross-Z dragon! Yeah!

Wareru! Kuwareru! Kudakechiru! Crocodile in Rogue! Oraa!

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

Then they all regained their memories as Akira regained those memories back as they all fight together

Timeskip

Akira then told Sento and the others about what happened

Ryuga: "Well that makes sense."

Sento: "So whose the new enemy?"

Akira: "Basically all main villains from the movies and a new enemy name Destroyer. He's a dark version of me and that's why I have white hair."

Sento: "So then that means..."

Blood Stalk: "Hello."

Sento: "Than that means that power up?"

Everybody else: "Yep."

Gentoku: "Well then- wait something isn't right."

Sento: "Yeah...oh yeah where's your girlfriend?"

Akira: "She has no idea either, memories as well." Gentoku opens his jacket to show a t-shirt that said 'best match'

Ryu: He sighs " I can't believe this but come on you two were a best match."

Akira: "Ok first of all I have no memories of her."

Ryu: "We will try again to bring back the second best match!"

Akira: "Whose the first?"

Ryu: "Me and Akeno." Everybody else laughs "What?"

Hygami: "You and Akeno best match! Please it's me and Momo."

Itsuki: "Negative me and Xenovia."

Saji: "Oh come on it's obviously me and Sona. Servant and master you can't beat that!"

Akira: "Let's just take this outside to see whose right. Also dad how did you meet up with Rossweisee?"

Sento: "Uhh..." Then Akira pulls out Springer and the tank as he inserts the Gatling bottle onto springer and the tank bottle onto the tank "Wait what are you- Ahh!" Then they fire at him which he ran as the two pets chased after him

To be continued

Next time on Let the experiment begin 2: Heroes reunited

Akira: "OK THIS IS GETTING ANNOYING!"

Killbus: "We'll have to destroy this planet."

???: "Mistify."

???2: "Time to end these miserable knockoffs."