Sword Art Online RPG?

[Omnitiger]

After watching the Sword Art Online anime, it has got me interested in finding a rpg that has an VR/MMO feel to it, or maybe even manipulating a current rpg to get satisfactory results. The players would be in vr world and in real world in the game, not sure how to approach that issue, the players would be in the vr world most of the time and thats where i want to focus, maybe just use diceless roleplaying for the real world? Anywho, im here to get some ideas and suggestions on any current rpg's that might fit this type of game or ideas on how to go about manipulating a current rpg to fit this and which one in particular. Thank You in advance!