Something like Attack on titan?

Attack on titan might be one of the best shows i watched so far and i am still looking for that high.

Its lighting paced action grabbed my attention at first, but then the overall mistery kept me engaged, at no point did we knew what was really going on, each reveal was more insane than the previous, yet in hindsight they all made perfect sense and we were given all the clues, when all the pieces came together and we were let on about the truth, the whole setting was flipped upside down, and the story almost changed genre, but it still worked perfectly! But even without all of that, the characters are still interesting and loveable enough that i could watch them just hanging out at the park or something.

Plus i really enjoy stories in general where people are going up against horrors beyond comprehension because there is just no other option.

I know this is all pretty vague, but that just leaves room for more recommendations.

Basically i am looking for something with mistery, action, conspiracies, dark themes, plus point if its a unike setting.

Or just give me whatever comes to mind.