For more image see: Ghost in the Shell: S.A.C.
Ghost in the Shell: S.A.C. 2nd GIG (攻殻機動隊 S.A.C. 2nd GIG Kōkaku Kidōtai: Sutando Arōn Konpurekkusu Sekando Gigu) is the sequel to the anime series Ghost in the Shell: Stand Alone Complex, based on Masamune Shirow's Ghost in the Shell manga series. It premiered on 1 January 2004 in Japan on the anime communications satellite television network, Animax, on a pay-per-view basis. The series was later aired on the terrestrial Nippon TV from 12 April 2005.
Summary: In a futuristic world where the internet and cybernetics has blurred the borders between societies; the members of Public Security Section 9 are reinstated to assist in solving numerous cases of cyber crime. A spate of similar crimes committed by separate suicidal groups known as "The Individual Eleven" becomes the core focus for Section 9 as war approaches in the form of refugees flooding into the country.
In the future, life between the digital and physical world has been blurred. The boundary of technology and humanity has been stretched beyond imagination with lives being led in both the electronic and physical worlds. With the melding of man and machine, a new cybernetic level of existence is being created - An existence that continues to redefine mankind.
(source: Wikipedia, ANN)

Related anime:
Ghost in the Shell
Ghost in the Shell 2: Innocence
Ghost in the Shell: S.A.C.
Ghost in the Shell: S.A.C. SSS