Summary [AniDB]: * Based on the Koukaku Kidoutai manga by [Shirow Masamune].
It is 2027, a year after the end of the non-nuclear World War IV. A bomb has gone off in Newport City, killing a major arms dealer who may have had ties with the mysterious 501 Organization. Public Security official [Aramaki Daisuke] hires full-body cyber prosthesis user and hacker extraordinaire [Kusanagi Motoko] to investigate. Working on the case with her are: "Sleepless Eyes" [Batou], who believes Motoko is a criminal; Niihama Prefecture Police Detective [Togusa], who is investigating a series of prostitute murders he believes are related to the incident; and Lieutenant Colonel [Kurutsu] of the 501 Organization, who also wishes to keep an eye on Motoko. Meanwhile, bits of the past of the members of this new Public Security organization, [Section 9], begin to surface.