*looks around* I know this is quite an old post but I just saw it and one in particular stuck in my head XD
I don't know if you heard of it but it's a manga called NO.6, it's based in the future and is mainly about this city which is surrounded by a large wall, and all the people in the inside have special rules to go by, if they go against it or question it then they get arrested. So the main character (a boy) goes against the rules and is thrown out and meets this other boy. Anyway the chemistry between the two main characters is utterly adorable, it's also not a very long series and has been turned into an anime ^.^