Previously on Let the experiment begin Azazel gave Akira two dvds which one contained the information on about his father. Meanwhile Ryu was getting punished but enough about that. What will happen next
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Akira was in class sitting at his desk until he sees Ryu enters in with his eyes looking like he haven't slept in over a day

Akira: "Dude are you alright?"

Ryu grabs him by the shoulder

Ryu: "She.. didn't stop..." Then he was out cold

Akira: "Well I guess he's dead. Now that means I'll be taking that." He was about to take the Sclash driver until the shock of surprise Ryu woke up

Ryu: "Don't you even dare." He said it in a threatening voice

Akira: "Alright Alright. Also take this." He handed Ryu a letter

Ryu: "And that's?"

Akira: "Read it."

Ryu opens the letter

Dear Kamen Rider Cross-Z,

It has come to my attention that you could be powerful so I will fight you later this afternoon.

Ciao,
Blood Stalk

Ryu: "That's it I'm going for it!"

Akira: "Reminder What are you gonna do about Akeno?"

Ryu: "Can't you create a clone of me?"

Akira: "Yeah and let me create a giant octopus." He said it with a sarcastic voice

Ryu: "Ok, ok jeez you don't have to be mean."

Akira: "I'm not." Sighs "Welcome to season two y'all where crazy stuff will happen."

Timeskip

It was afternoon and Ryu was standing near a water fountain

Ryu: "Alright Blood Stalk come out." Then Blood Stalk appeared behind him

Blood Stalk: "Kamen Rider... Cross-Z was it?"

Ryu: "Eh you forgot me?"

Blood Stalk: "Should I remember you. You're a sidekick for Build. He's like Batman to Robin. He's Batman and your Robin

Ryu: "You'll be beaten to a bloody pulp!!!"

Blood Stalk: "Oh is that so? Well then hurry up and fight me."

Ryu: "Fine!" He pulled out the Sclash Driver and then insert the dragon jelly

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 being inside of a tank of blue jelly and then forming to become Cross-Z Charge

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

Then both Blood Stalk and Ryu proceeds to fight with Ryu using the twin breaker and Blood Stalk using the transtream gun and steam blade

Blood Stalk: "Come on is that the best you got?"

Ryu: "Shut up!" He was getting angry and then he continues fighting with anger

Blood Stalk: "Hazard level 4.0...4.2, 4.4 He just keeps rising."

Ryu: "Gah!!!!!" Then he pulls out the dragon Fullbottle and insert it into the twin breaker

Single!

Then he fires a blue ball of energy at Blood Stalk

Single break!

Blood Stalk blocked it and then Ryu inserts the dragon jelly into the twin breaker

Twin!

Twin break!

This is where Blood Stalk fell but was able to stand back up and just laughs

Ryu: "What's so funny?!"

Blood Stalk: "The reason I wanted to fight you is to see if you can beat me but now it's best if I end you."

Steam break!

Then a purple energy ball was fired at Ryu and then he was defeated

Ryu: "Gah!" His armor disappears and was covered in bruises

Blood Stalk: "Ciao." He disappears

To be continued

Next time on Let the experiment begin

Akira & Akeno: "You idiot!"

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

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