Source taken from AniDB.net/Wikipedia.org
Needless (Nīdoresu?, stylized as NEEDLESS) is an action/comedy/science fiction manga and anime series by Kami Imai. Serialized in Shueisha's seinen magazine Ultra Jump beginning in 2004, an anime adaptation by Madhouse began airing on July 2, 2009.
Year 2130, after the third world war, large contaminated areas known as "Blackspots" formed all over Japan. Large Walls were used to quarantine off these "Blackspots".