The promised never land and owarni no seraph

[Kaname]

Don't you think they are very similar? We don't have vampires in promised neverland but monsters. I always get the feeling that they are very similar

 

[Star_Of_Hope]

Well, I am not sure I get the similarities.
In promised neverland, no one knows whether humans with freedom exists or not unlike owari no seraph

 

[Blackangel]

i never noticed but these similarities are common for every genre.
i don't think they are very similar like you seem to think