Ghost in the Shell Stand Alone Complex Vol 5

16 years ago, a terrorist group called the "New World Brigade" kidnapped a young girl named Eka Tokura. However, recent photos of Eka have surfaced and she appears to look exactly as she did 16 years ago. To investigate this mystery, the special unity of the Maritime Safety Agency was dispatched to a man-made island off the coast of Okinawa that has been seized by the Brigade. However, communication with the special unit has been lost, leaving the island and the Brigade in a shroud of secrets. Section 9 is tasked with the job of finding out what happened on this man-made island and discovering the truth behind Eka's age-defying looks.

Source: Anime News Network Encyclopedia