City Adorned in Light
By harboring a fugitive, Shion is stripped of his elite citizen privileges and forced to live in the suburbs with his mother. Four years later, while working at the waste disposal center, he learns of a mysterious parasite that makes people grow old and die in seconds. Having questioned the authority of the city once again, Shion is arrested, but is rescued by Nezumi while being transferred to prison. After the duo escape from the city's limits, Nezumi shows Shion what really lies beyond the walls of No. 6.
Aired 15/07/2011EP 2 - City Adorned in Light

No.6
In a near future world, after the last great war, most of mankind lives in a handful of city states. There, for the privileged elite, life should be perfect. But for young Shion, the only thing perfect has been the nightmare his life has become since letting a strange boy called Rat spend the night in his apartment.
Banished to the outskirts of the city and stripped of all privileges for helping the mysterious stranger who has since disappeared, Shion now finds himself in even worse danger as his inquiry into a new series of mysterious deaths results in his being arrested on suspicion of murder!
But even as Shion is being sent to the city's Correctional Institute, the long-missing Rat reappears to rescue him! Now on the run, the two young men have only one chance at survival: uncover the mysterious secrets that lie at the sinister heart of No. 6!
(Source: RightStuf)