A boy wakes up in a middle of no where then he is caught in some kind of war he saw foot soldiers called Kasshine and Dai Mazine and they were from an evil organisation called Hundred then they were suddenly attacked by an explosion and the boy saw...
It has been few days since the defeat of Shadow Kuuga and Y/N has acquired Kuuga Chemy card and now the vision of the next rider will show himself soon
Y/N was in the classroom and was still in in deep thought then someone tapped him his head
Y/N: Huh?!
Y/N looks up and he see's Hilda behind him
Y/N: Hilda?
Hilda: Hey you need to focus on the math homework we were given you dork.
Y/N: Hey!
Hilda was laughing at Y/N
Hilda: Are you still thinking about that red and blue Kamen Rider from before?
Flashback to seeing Kamen Rider Build though the aurora curtain.
Y/N: Is it that obvious?
Hilda: Yeah you were like that ever since you met Godai Yosuke.
Y/N: Well I couldn't stop thinking about that time because it came true.
Hilda: That's good that you met him and you both saved that man who was forced from being Shadow Kuuga has there been any contact from Mr Ichijo and Godai?
Y/N: Well the man woke up and he remembers being the ruins where the Gurongi was revived and then some grunts grabbed him and they shoved a card into him and turn him into Shadow Kuuga.
Hilda: Could have Hundred done this?
Y/N: Yeah Kaguya explained that they used people to create Shadow Riders to help expand their army but who knows which Shadow Rider will show up.
Hilda: Don't worry you'll be ready to fight back but now we need to study.
Hilda hold's up the math homework right in front of Y/N
Y/N: Oh man...
Somewhere else in a science centre a man was experimenting with equipment
Scientist: No these result's are bad!
He throw's clipboard to the floor while being frustrated
The suddenly Kasshine grunts enter the the room
Scientist: Who are you all!?
Kasshine Grunt: We are servant's of the great Hundred you have been chosen
Scientist: Chosen?
Kasshine Grunt: Would you like to see better result's
One of the Kasshine grunt revealed a Shadow Rider card and this time it was a Shadow Build card
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Scientist: Huh what's with that card-
He caught caught off as the Kasshine grunt shoved the Shadow Build card inside of him
