Demon Slayer manga might restart because Gotouge left the biggest mystery unsolved

Demon Slayer's manga concluded a few years ago. The fandom is waiting for the final arcs to be adapted into the critically acclaimed anime by Ufotable, but that doesn't mean that everything was solved in the series. Author Koyoharu Gotouge had, by her admission, rushed the ending of the series due to personal issues in her family, which is why some subplots and concepts were somewhat abandoned or ignored near the end.

However, one element that was never solved and could potentially serve a role in a Demon Slayer sequel was the Blue Spider Lily. These, of course, were the flowers that were pivotal in Muzan's rise and fall in the series, which is why they could be a factor if Gotouge ever decides to do a sequel, as the YouTuber AnimeUproar mentioned as a theory in one of his videos.

Disclaimer: This article contains spoilers for Demon Slayer manga and anime. Readers be advised.

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How the Blue Spider Lily could play a role in a Demon Slayer sequel

The biggest unresolved mystery in the series is how Muzan turned into a demon through the Blue Spider Lily and how that very thing took him down, all without significant explanations. Sure, it is explained that a doctor created a treatment for his sickly body when he was human and said treatment was what turned him into a demon, kick-starting his quest to create more and gain sun immunity, but this creates more questions surrounding the Demon Slayer lore.

The series explains that these flowers, which are not that rare as the time skip in the final chapters of the manga reveals they are still around, can turn people into demons. Considering how many centuries Muzan lived, the fact that no one but the doctor who treated him decided to use them for that purpose seems far too convenient.

This potential mystery could play a significant role in a sequel if Koyoharu Gotouge decides to return to the franchise. After all, the potential is endless: the series took place in early 20th century Japan, but some demons could have escaped abroad or survived after the final battle with Muzan. Other people could have discovered how Blue Spider Lily works and what they could do, leaving room for potential to explore.

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The validity of a sequel and what it could mean for the franchise

It's no secret that the Demon Slayer manga had a poorly received ending, and there were a lot of valid reasons for the fandom's reaction. From poorly-constructed endgame relationships such as Zenitsu and Nezuko to how underwhelming Muzan was as a villain or how the series was so fast-paced in its final arc, Koyoharu Gotouge just wanted to end the manga and focus on her family at the time.

All of this makes it very understandable for the fans to want a sequel, especially with the potential that the Blue Spider Lily brings to the table. However, it doesn't seem likely that the author would like to return to the series. The manga proved to be a monumental hit for her, and she is probably quite happy with how things ended.

While nothing is impossible, it is not likely that the franchise will ever be expanded on beyond a few tidbits here and there.

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Final thoughts

The Blue Spider Lilies and how they played a role in Muzan's rise as a demon is a concept that has never been fully explained or developed in Demon Slayer. It is understandable why fans would like a sequel to explore this concept and provide a lot more depth to a series that has been very successful and beloved, albeit considered to have struggled with world-building by fans.