Shinsekai yori, Suisei no Gargantia Recommendations
Both anime involve themes of censorship, war, and morality. Both anime have a huge plot twist and similar execution.
Similar after apocalypse premise. Once successfully survive the apocalypse, humans form small colony. But information of the cause of the apocalypse still remains classified. After stories develop, the dark truth behind the cause of the apocalypse slowly revealed.
These themes also includes morality concern, war between species, classified information, ancient civilization, and human experiment. One retell the story with the supernatural and the other one with sci-fi.
Battle for survival. The eradication of a species. Science gone wrong.
In both series, there are dark secrets that becomes unraveled as the episodes progresses. These involve humanity and their origins.
Among other factors, there is the concept of morality that comes into play regarding civilization and the people/creatures in them. From that, there is also conflict that results in battles/wars between the two sides.
There is supernatural elements present in both series that is a thrilling ride as our main characters takes on an adventure that they may never forget.
In both anime, there's a war between species. Information is often censored in each society and both protagonists receive a revelation.
Both have somewhat of a Utopian setting but turns into a major plot twist towards the end.