Sure, the SAO light novel is finished. It concluded with a series of climactic events and resolutions that left fans either delighted or wanting more, depending on their expectations.
As the details of this 'SAO 15' light novel are not clear, it's hard to say the exact plot. However, in the Sword Art Online universe, the light novels typically deal with themes such as the blurred lines between the virtual and real world. So, this 'SAO 15' could potentially explore how the characters' actions in the virtual world impact their real - life selves even more deeply. It might also have a sub - plot about the evolution of the virtual world's technology and how it affects the gameplay and the characters' abilities. There could be a story arc about a new mystery that Kirito has to solve, which could lead to unexpected revelations about the nature of the virtual world.
Well, generally in the Sword Art Online light novels, they often explore different aspects of the game world. 'sao 17 light novel' could be about how the characters are dealing with new threats in the game. Maybe there are new powerful enemies that the players have to face, or it could be about the relationships between the characters evolving as they go through more experiences together in the virtual realm. It could also introduce some new mechanics or areas within the game world that the story focuses on.
I think 'Sword Art Online: Alicization' is also very popular. It has a large - scale story that spans across different worlds and has some really deep themes about consciousness and existence. The complex world - building really attracts a lot of readers.
Well, I'm not entirely sure specifically about 'sao 18 light novel' without more context. It could potentially have unique characters, an interesting plotline that sets it apart from other installments in the series, or perhaps a distinct writing style.