But is going to be a parallel universe, so if anyone wants to follow the actual story, they'll need to read the manga.Since season 2 is directed by Ishida, I don't see why not both.
I don't encourage them not to read the manga, it's 100% worth it. I just wanna say that watching season 2 can do no harm. (As one of the few who genuinely enjoyed season 1)But is going to be a parallel universe, so if anyone wants to follow the actual story, they'll need to read the manga.