Calling it a sequel is in some ways wrong as we follow a different cast of characters on their journey of what happened at their location during the first book. They narate the story to Khirin and the intreludes of what happening in real time are really interesting as well are the footnotes of the in universe author of the book. The realtime parts of the book however happens after the first so it's not wrong calling it a sequel. I'm looking forward to figure out where the story is headed next and if there will be as many new characters introduced again. I'm leaning towards no, but I won't be surprised if the opposite is true.