Kamen Rider from the ancient times

At first, Kawahara thought he had traveled back to primitive times.
Until Gurongi started hunting his tribe.
It wasn't until his body was torn apart by the incompletely developed Agul Belt that Kawahara realized something was wrong.
This is Kamen Rider Sora’s world!
Help, I can still survive!
……
Riku: "In order to protect my sister's future, I will follow the will of Mr. Kawahara and seal away all the Gurongi clan!"
Godai: "In order to protect people's smiles, I must choose to fight! Kawahara-senpai, please watch my transformation!"
Kawahara: Save me first! I can still be saved!
……
……
【Key points】
He will also travel back and forth to other knight worlds, mainly the worlds of Kuuga and AgitΩ, and mostly stories about Heisei knights. The protagonist has cheats, but is not invincible, and is growth-oriented.
Book friends group: 1046895992 (Ultra Group, Special Effects Family).

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