Perfect societies always seem to get a bad wrap. Within the utopia there always is a supposed corruption that leads to it's inevitable downfall. With all fairness, who's the one to judge how masses upon masses of people should be managed? If a lie brings the dwellers happiness, then is it your moral responsibility to take away this sense of comfort from them? Well, to answer in short, "it depends".
No.6 is one of the six pods that were created after a war that left the world desolated. The pod creators mission was to build a peaceful paradise, but somewhere along the way they became power hungry. They had very rightist/socialist views on the governance of their citizens. Just like how Kadafi oppressed his citizens, the mysterious people behind the curtain in No.6 had the same political ideology, but in a much less blatant way. Everything remained very hush-hush.
But the government wasn't the only one keeping secrets. Before you even indulged to know what the anime was about, you (the reader) probably already knew that this was given the yaio stamp of approval. Here comes the inevitable, "I don't have anything against them, but..." no I won't do that, instead I'll just write that it wasn't particularly needed (more explanation on what I mean in a bit). Sion and Nezumi (The main characters) might have as many romantic moments in the series than you can count to on one hand.
Their personalities actually contrast one another. Nezumi is the headstrong character with a grudge against society, while Sion is the compassionate world loving type. They come to meet each other by complete chance. Nezumi is a runaway who happens to run by a boy caring enough to provide him shelter from the rain. Sion is on the balcony screaming into the wind, until he sees a boy in distress who needs his medical attention.
Unfortunately, the first episode is the best of mini-series that only carries nine episodes in total. The pacing of No.6 was far to fast to get attached to the storyline. The characters were all too dramatic throughout, especially Nezumi, who grabbed Sion by the collar repeatedly out of aggravation. Nevertheless, even during the light moments, your telling yourself, "You can't possibly be that happy to be cleaning a dog." Cliche is cliche. I'll give it this though, the animation was unprecedented.