I was shocked and disappointed after I decided to pick YKK up after checking it had nothing but 10 reviews. So here comes a balancing effect, observations of one of the few who do not consider it a masterpiece.

This manga is a lot like some children's TV program about "what the Teddy Bear did today".

Sure it's "pleasant" to read but that's about where it's good aspects end.

There doesn't seem to be any kind of real continuing story, except "life, which goes on" which hardly is sufficient for a "masterpiece".

We are presented with very haphazardly explained new technology - one might even say, perfectly justifiable, that it doesn't make any sense. For "science fiction" YKK is laughable.

Character designs are heavily caricatured, which subtracts from the realisticality and adds to the "this is for kids" feel.

There're also fanservice-ish moments and things, like how the fembots exchange information by tongue-kissing. (And no, that cannot be justified by "it just adds to the realism, their creators happened to be perverts you see, and many people in technical careers are really perverted nerds".)

Not really anything more to say. Simple summary of a simple manga.

Does it succeed in attaining its goals? I think so.

Are theis goals something so brilliant, original, mature and mind-revolutionizing YKK deserves a 10 or 9? I don't think so.

Do/did I enjoy reading it? Save for the disappointments in relation to the hype, mostly yes.

Is sole personal enjoyment enough to earn something a 10 or 9, if all other important parts of a story lack and the whole thing's mostly a carbon copy of a dozen of similar works? Not in my system.

Now that you know what is defective in YKK, and don't just face a wall of 10 reviews giving impression of "this is for everyone", you may confidently proceed to read it and form your own opinion. I pass the baton.