Sorry, there's no legal and safe way to read Demon Slayer manga for free. You should support the creators by purchasing or subscribing through official channels.
The Demon Slayer manga is quite extensive. It has a substantial number of chapters that tell a rich and engaging story. To be precise, it has over 200 chapters.
The manga of Demon Slayer has come a long way. It has numerous chapters and volumes that have taken the story to exciting and unexpected places. The plot keeps thickening with each new installment.
It's hard to give an exact percentage, but the anime covers a significant portion of the manga. However, there's still a lot of content left for manga readers to explore.
As of now, there are a specific number of Demon Slayer mangas, but it's constantly changing with new releases and special editions. You might want to check the latest updates on official manga platforms or fan communities.