Yes, it's quite normal. Fanfiction often offers unique takes on the 'Jujutsu Kaisen' universe, and it can enhance the viewing experience. It allows fans to explore different storylines and character developments that might not be in the official show.
You can start from the chapter that picks up right where the movie ends. Usually, you can find this information in fan discussions or on manga-related forums.
Archive of Our Own (AO3) is a great place. It has a large collection of 'Jujutsu Kaisen' fanfiction. The tagging system there makes it easy to find specific types of stories, like those related to certain characters or plotlines.
The Jujutsu Kaisen manga has been running for several years and has a considerable number of chapters. But the exact length can vary depending on how you measure it, like by chapter count or total story arcs.
I'm not sure exactly, but as of now, there are quite a few volumes and chapters. You might want to check reliable manga databases or official sources for the most accurate count.
Well, to find out where the Jujutsu Kaisen manga starts after the anime, you need to look for the chapter that comes next. Usually, there are online forums or manga communities that can give you specific chapter numbers for a smooth transition.