[henshinzero]

Ryuki's World:
The world takes place in a battle called the 100 Rider War. Some fought for their own ambitions, some made friends, some want the fighting to end. Ryuki is the only one to stop it. But he'll need allies of his own to stop them. Knight, Zolda & Femme so far are the only friends he has.

Kiva's World:
Wataru works for the organization against the Fangires.

There is no longer the 13 races. They gained weapons from each race.... similar to the Devil Arms. In secret, Wataru is the Fangire killer, Kiva. IXA doesn't know his secret until he discovers his heritage.

If Decade was rewritten, he'd face each rider's world rider. And I don't mean the main riders. Every rider from their type.
ex. Abyss.