The story was about a universe where people were segregated by different aspects and trait of personality. I remember that there were seven different planets (?).
One of these planets was the world of partying, where every sin imaginable was OK. It was even the law to take drugs if you were a citizen of this planet.
There was another planet of “Wisdom” or “Order” (?) where every person with good logic and a passion for learning and expanding their knowledge lived. Everything was calm and silent on that planet.
A 3rd planet was the planet of “creativity”.
I can't remember the other 4 planets.
All of this universe was govern by “The Immortals”. The last human alive after the last war, and they've decided to divide the society into these seven group based upon an important person’s study in the far past. No one knew how they could still be alive.
The story was about one man who was at his 20th birthday more or so. I think this was the day you were assigned to your new planet. This man refuses to go where he is assigned so he is send to be judged. And then, at the audience, he attempt to flee. He suddenly bumps into a girl, that was there because she refused to have sex on her planet which was the planet of partying, and they decide to make their way out together.
The last thing I remember reading was that this duo had just learnt about the Immortals, and that those Immortals had just been afflicted by an illness that may end their immortality. So they decide to go on an adventure to learn more about the past of the humans by learning more about these Immortal (the last remains of ancient human civilisation).
There were shuttles or crafts/ships but not for everyone. You were expected to stay on your planet and obey your own laws.