After harboring a VC, Shion is stripped of his elite citizen privileges and forced to live in the suburbs with his mother. Four years later, Safu leaves him to go study abroad in No.5. While being with Safu, Shion comes in contact with a rat that had Nezumi's voice. While working at the park security, Shion learns of a mysterious parasite that makes people grow old and die in seconds before a wasp emerges from their necks. Shion questions the authority of the city once again after one of the deaths isn't shown on the news. Shion's co-worker also dies from the parasite shortly after and Shion is arrested. While being taken to the correctional facility, Shion is rescued by Nezumi and has to throw away his ID bracelet. After the duo escape from the city's limits, Nezumi shows Shion what really lies beyond the walls of No.6.