Sword Art Online II: The Ghost in the System

After Sword Art Online was cleared, Kayaba's brain was fried, but his consciousness remained in the system. Why couldn't anyone else's? Meanwhile, Sinon has just gotten back to playing Gun Gale Online, but there is a new and OP player in town. Is there a connection between these seemingly unrelated occurrences? So grab your Amusphere, lay on your bed, and yell LINK START!