Deus ex machina (Latin: "god from the machine") is a character or object who appears unexpectedly in a story to resolve an apparently unsolvable situation in an unlikely but unexpected event. But what if that person or object weren't there to save the day? What if they are there for their own agendas instead of helping the heroes? What if, instead of solving the problem, things get worse? This is the story of Kamen Rider, but not the kind you would expect. Dark Riders, Evil Riders, Villain Riders, and so on. Whatever you call them, they appear across fiction, wreaking havoc and destroying both heroes and villains alike. P.S. I do not own Kamen Rider or any piece of fiction in this story. This includes the arts as well. All belong to their rightful owners.

Here I stand. In a strange world where war is a constant, people fight for ideals they don't understand. A man from another world sought to make a difference, but is he a peacemaker or just another warmonger?

Individuals from all over space-time have gathered in one place. What brought them here? ... To watch movies, of course!

After two losing rounds, humanity has to face the "Most Fearsome God": Poseidon. A mere mortal in suit, known as Kamen Rider G3-X, now stands against him. Who will emerge victorious? A crossover one-shot between Kamen Rider Agito and Record of Ragnarok