I don't have enough information to determine if it's popular. It could be popular among fans of the original novel who are eager to get more content related to it.
It could be a way to extend the popularity of the original novel. By creating an 'extra novel', the author can keep the readers engaged for a longer time.
I'm not sure specifically as I haven't read it in detail. It could be about a variety of things like an extra story related to a main novel, perhaps exploring side characters more deeply or expanding on events in the original novel in a different way.
Reading the extra novel can also enhance the reading experience by giving more context. There might be details about the world - building in the extra content that make the fictional world of the main novel more vivid and believable. For example, it could explain some cultural or historical aspects of the fictional world that were only briefly mentioned in the main story.
Tao Yaoyao, the heroine of the book " I Love You, Tao Yaoyao," had always thought that she was extra, but later she realized that she was never the extra one, but the indispensable center. I recommend this modern romance novel to you. I hope you like this fairy's recommendation.😗
One example could be an extra light novel for a fantasy series. It might tell the story of how a particular magical item was created, which was only briefly mentioned in the main novel.
You can also check some e - book platforms. Some platforms might have the extra novel included as part of a special edition or as a supplementary material. Just search for the title of the main novel along with 'extra novel' on the platform.
I'm not sure specifically as 'extra magic novel' could cover a wide range of stories. It might be about a world filled with extraordinary magic, unique magical creatures, and characters with special magical abilities.