Okay i have watched Kamen Rider 1 movie raw. Details are:Spoiler, click to toggle visibilty
*A dying cyborg Kamen Rider 1
*Shocker Civil War between Ambassador Hell's Shocker faction & Shocker Nova
*The main item of what the villains after is Alexander the Great Gamma Eyecon:
**Originally, Shocker was given by Dark Mind Gamma Ultima, until it falls into possessing Tobei Tachibana's granddaughter, Mayu
**Shocker manage to release the Alexander Eyecon from the girl's body, but falls into the hand of Shocker Nova's Urga, whom soon ended up posessed by that Eyecon, killing his two main loyalist
*Though Takeshi died by Urga Alexander's attack, he is fully revived soon enough and becomes very well
*An uneasy alliance between Kamen Riders and Ambassador Hell, after all his Shocker faction members wiped out
*A certain end parts between Takeshi Hongo and Ambassador Darkness reminds me of Kamen Rider Drive's final episode between Shinnosuke and Heart, but some are different
There's another news about Kamen Rider Ghost Summer Movie, not just Ex-Aid cameo: Spoiler, click to toggle visibilty
Kamen Rider Dark Ghost is Kamen Rider Extremer