Ghost in the Shell Stand Alone Complex Vol 3

From the Kodansha edition

Marcelo Jarty, the hero of a democratic revolution, and South American drug dealer, has been coming to Japan periodically and no one knows why. The Major and Section 9 track his movements after he makes his latest appearance in the country. They are determined to figure out the meaning of his visits, but following Jarti leads to more than they could have possibly expected….

Source: Anime News Network Encyclopedia