As far as I know this book is a standalone, and it can be read as a standalone. However, saying that, the end of the book could have easily been made into a sequel. Other than that, this was a really original book based on Japanese mythology, something I haven't seen before in any book based on mythology. I enjoyed all the characters, hated the plot twist at the end (those that have read the book know what I'm talking about) and was overall a very good book. The end was kind of lack-luster though. I really do hope there is a sequel in the future.