The novel is no other than another spin off from the manga series. A sequel if you will.
A world famous video virtual reality game turns into a disaster as the creator of the video game announces that no one will be able to log out. And if they wish to exit the game, they will have to clear the 100 levels and beat the boss. If they die in game they die in real life!
Kirito a beta tester, knowing well of the game before hand, embarks into a journey (in the game of course) And try to clear all 100 levels. Other players join his cause and secrets are revealed as the game goes on!
This was a novel so there is no much to say about it art-wise. However there are good illustrations at the end of each chapter. I recommend this as a good read!