Tegamibachi, No.6 Recommendations
Akatsuki and Chronos seem to have the same concept: the bigger and better city. Plus, Shion and Nezumi can easily be compared to Lag and Gauche.
-Utopian cities that are separated by walls from the rest of the world and have terrible secrets
-Surrounding cities with citizens living in poverty who detest the Utopia city
-Adorable white-haired boy with a resolve to save people/help people
-Seemingly cold guy who saves the white-haired boy
-Caring mother separated from child
similar characters (Shion is very similar to Lag) , government-like secrets, bugs, travelling.