I 've watched all the episodes and this is my review
Story (9/10)
Very simple story about Tokyo is attacked terrorist but the producer makes the simple story becomes interesting. The story is very surprising and very creative . Usually main character in other anime act as a bomb squad but in ZnT main characternya play as a torrist itself
Art (10/10)
One of the best anime of the art . All described in great detail . walls were dirty , rusty fences or characters depicted perfect detail.
Sound (9/10)
BGM its very fitting with the conditions and make the audience participate tense. Cool OP, and I really like Gallio Gallilei
Character (7/10)
Ufortunately only 3 characters are memorable , namely duo terrorist and bomb disposal ( Shibazaki Kenjirou ) while Lisa which acts as the main character has a lesser role in this anime.
Enjoyment (9/10)
I really like this anime and watch it repeatedly.
Overall (9/10)