Kamen rider Ryuki X Sword Art Online: Survive within a RPG video game

Sword Art Online is a open world RPG mutilplayer game where everyone can log on and enjoy there time and have a lot of fun playing with other players however, when the game was fully released and people brought the game and played it, they realised they are trapped and have to survive a world filled with monsters I order to defeat the final boss.

What makes it more worse is that rumour say that mysterious armoed warriors known as Kamen riders will try their best to stop players to get to the final boss and even by killing them if they have to. Some riders fought for good but players have no trust to either of them.

But soon a hero will come when a boy woke up in a forest game without no memory how he got here but soon he becomes the greatest hero that not only Sword Art Online have ever seen but the world as well. Who are these evil riders, why are they here, what are the threats that this boy must journey through I order to save the world and more importantly....why was Y/n also known as Ryuki....is here?