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 a few days after the incident with the Worm that copy Kenji appearance and became Shadow Kabuto from contracting with Hundred
Y/N has met Tendou Souji Kamen Rider Kabuto and went through training with him in order for him to gain the power of Kamen Rider Kabuto which he succeed with gaining the Kabuto Chemy card
Legend and Kabuto were able defeated Shadow Kabuto together and destroyed the Worm Kenji
The next Rider to appear is Kamen Rider OOO
Meanwhile at building as the place was called Kougami Foundation a man was watching lot's monitors as it shows Kamen Rider Legend fighting Hundred Kasshine grunts and the past Shadow Rider's that Legend has encounter and met the other Kamen Rider's he's met and gain their powers
A woman come's into the man office holding files and a suitcase
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???: Ah Miss Satonaka you arrive in the right moment!
Satonaka: I have the file's you requested Mr Kougami and the delivery is here.
The man turns around from his monitor
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Kougami: Perfect!
He look's at the files as it has the name Y/N and Hilda on it
Satonaka noticed the monitor showing video recordings of Legend and Mythro
Satonaka: Mr Kougami why have you asked me to get info about this boy called Y/N is he the gold Kamen Rider that's been appearing to fight those strange monsters?
Kougami: You are right that boy is Kamen Rider Legend as he is the rider who will inherit all of the riders power's and for fill his desire to stop this organisation called Hundred and defeat the Shadow Rider's that they brought back using the Legend rider's who once saved our world.
Satonaka: Do you think they will create a Shadow Rider of OOO?
Kougami: Possibly yes but it will depends if they use a random civilian or use someone we know to become a host and will not have free will to be in control.