The story how the government had these secret training centers for orphans, terrorists were actually the good guys, the part where detective shibazaki had to solve their riddles and stuff like that...
mainly the modern theme, and how the main characters are always in the run but they know what they are doing .. and how the plot armor isn't so apparent. the antagonist/s are "cool and smart" not "evil and stupid" you don't hate them just because they are against the MCs I also liked the conversations .. you don't find conversations about "he's evil let's kill him" or "he saved me = I must marry him" I know its impossible to find such a novel because ZNT was so short x"D
I didn't find anything that comes close sorry xD I liked Darker than Black & Psycho-Pass tho < ANIMES
Try Terror man. It's a webtoon and not as good as zankyou no Terror. The only similarity ist actually the Terror part. Dont know what to recommend
I'd recommend Psycho-Pass as well, it's a great anime, thought the 2nd season kinda disappointed me but it still wasn't bad. Darker than Black was quite good as well but I really disliked the 2nd season. So watch Psycho-Pass if you haven't already!