Raijin is the japanese god of the lighting and thunder. Sorry for stealing your "thunder" there Slayer, I had to do it.

Also, after looking at Dharc's character sheet I remembered something. There are Items and Game objects (Things like Dharc's earing and TVs like the one in the Cave) That allow the player to access outside data sources such at the internet, cable broadcasts (or whatever we have those days) and Phones. Unlike in SAO, there is contact with the outside world