Yakusoku no Neverland, Kimetsu no Yaiba Recommendations
Both anime have demons and children who are exposed to these demons early on in their lives and it drastically changes the paths their lives would've taken.
Both have great art styles, animation, characters, OST's and pacing.
Both are adapted from dark fantasy manga by shonen JUMP.
The promised neverland is about kids who were raised like live stocks in an orphanage that was not exactly what it seemed to be. The kids were raised to become food for demons and after finding out, they plan to escape. Both main characters face demons who had eaten their loved ones and both want to save what's precious to them. Although Demon slayer gives off more action and adventure than the promised neverland, the promised neverland is a very interesting and entertaining anime with unexpectedness crawling at every corner.
Demon slayer is about a boy
Something terrible happens in the beginnings of both of these anime's. ( People dying) Differences are just running away and fighting.