Houseki no Kuni (TV), Yakusoku no Neverland Recommendations
both have a dark side of their world right?
They both have the same plot twist of how the world they knew was not what it turned out to be.
Phos from HNK and the 3 kiddos from YNN are quite similar after they start doubting their world.
HNK is a gem (pun very much intended) that should not be missed if you enjoy YNN. I also see Shinsekai Yori in the recommendation. All three are very similar.