Zennou no Noa seemed liked a 'lets-give-it-a-try' sort of manga. Felt sort of dull at first, but by the end of the first chapter, it seemed to have potential. And it sure DID.
[NO SPOILERS HERE] [This is a not-too-long, not-too-short review]

OVERALL: 8/10
ZnN-TWoLM :P is very smart. The author has very nicely fused the story in 16 chapters. If your finding for a good thriller you can complete fast, you WILL like this. Whether you like it or not, you won't regret reading it.
[It would great if turned into an anime]

STORY : 10/10
This is the story of Escape.
2 years ago, a light bomb exploded in the skies in a certain part of Tokyo. Around 2 million people exposed to that light lost all their memories. All these people were shifted to an underground city and been living together ever since. They have been dubbed as 'KIDz' (i think its kinda dumb name, but it makes sense). Since they don't remember absolutely nothing but their names(of course), they had to be re-taught everything. The police and teachers and few other members who are living with these KIDz and have all their memories are called 'adults'.
It caused military dictatorship to rise in Japan. KIDz have been isolated from the rest of the world and are discriminated against.
They all seem quite happy on their own, but Noa, a teenager, feels like he has to get out. And when he encounters a 'spy' adult who may be related to his former life, he begins to execute his plot.

CHARACTERS:
Noa Ikurumi is one hell of a guy. 18 years and has a brilliant mind. Even smarter than the 'adults', he always make sure everything goes the way he wants.He would definately remind you of Light Yagami from the start till the end [which is why many recommend ZnN with Deathnote]. His attitude, the things he desire and the limits he'll go to get everything his way are very similar (I know, why am i recommending in reviews? Well, I find it hard to explain unlike other reviewers with their oh-so-great vocabulary. Then why am i reviewing? Oh bite me!)
The rest of the characters are all in the side with little role.

ART:
Art was the turn-down to me. The characters looked all sappy. Not that great.
[But never judge a manga by it's art......Never] Not this one either.

ENJOYMENT:
Now, this part would differ from person to person i.e. if they finish the whole manga.
There are some unnecessary comedy and ecchi scenes(nothing like That), very rare, but really doesn't add any meaning to that genre.
The author has put the story together very well in just 16 chapters. I kept wondering how would so much end in that much. The beginning, are all introductions to the story and all. Since Noa doesnt remember anything and the spy girl doesn't reveal much. But when Noa introduce the spy to His World, things set to motion from there. By the end, it is all very thrilling to whether his plan works out.
[Tip: don't keep any expectations for the end]

What you might or might not enjoy is The Twist...... (evil smile)