the novel's extra manga

Not really. The Vinland Saga manga mostly sticks to the core story without a lot of extra fluff.

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.

There were a few novels related to being an extra, including "I'm an extra in Hengdian,""I'm an extra in Escape Game,""I'm an extra in iPartment,""I'm an extra in Harry Potter,""I just want to be an extra,""I'm an extra in the world of fast travel,""Starting from an extra (Rebirth),""I'm an extra in Escape Game,""Entertainment: An extra, but was caught to challenge the Masked King," and so on. These novels covered different topics and plots, including urban emotions, suspense reasoning, time-travel, and so on. However, because the search results provided did not provide a specific summary or evaluation, more detailed information could not be provided.

[The following conclusion is that there are many types of novels and topics for extras, including urban novels, fast novels, and entertainment novels.] Some of the novels revolved around the protagonist's transformation from an ordinary person to an actor. Some of the novels even added fantasy or system elements. However, the current search results did not provide enough information to answer this question. Therefore, he needed to search for more information about the novel.

Typically, it's written by fans of the novel. These could be people who are really passionate about the story and its characters.

I'm not sure specifically as there are countless fanfictions. It could be about exploring additional storylines that weren't in the original novel, like developing side characters more deeply or creating new relationships between characters.

The 'Cardcaptor Sakura Extra Manga Sweet Love Story' likely focuses on the sweet love stories within the Cardcaptor Sakura universe. It might show the budding relationships, perhaps more in - depth exploration of Sakura's feelings for Syaoran and their interactions. Also, it could include other characters' love - related experiences in this magical world.

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.

I'm just a person who likes reading novels, so I can't provide the name of the novel. But I can tell you where to find this novel. I hope it will be of help to you. If you know the name of the novel, you can try to search for it in a search engine or go to an online bookstore or literary website. You can also try contacting the author or the bookstore to ask if they have any resources to share the novel.