Zankyou no Terror, Yakusoku no Neverland Recommendations
-Both anime's theme revolves around a dark psychological thriller. These anime will definitely take you on a major rollercoaster with tons of cliffhangers that leave you wanting more. If you like one, you will like the other.
-Zankyou is more subtle crazy, curious about discovering and figuring out what the real truth is while Yokashou knows the truth and figuring a way out. Both very big emotional rollercoaster. Both keep you on your toes after every episode
-Both animes have two main guy characters and one girl character, very similar personalities
-Both animes, the children are labeled with numbers and are born in a similar environment.
The Promised Neverland is similar to Zankyou no Terror, as the children have grown up institutionalised, eventually having to make an escape plan. In both shows the children are also given numbers like nine and twelve, which almost strips them of their humanity.