Advance of Zeta: The Flag of Titans is an original story set in U.C. 0084, and is the story of one of the first Titans' units, the Titans Test Team's Black Otter squad. It was serialized in the monthly publications Dengeki Hobby Magazine and Dengeki Daioh. The Dengeki Hobby serial takes the form of a photo-novel accompanied by mechanical designs, technical information, and model photographs, while the Dengeki Daioh serial is in a manga format. The two serials cover many of the same story events, but some characters and events are depicted only in the photo-novel or only in the manga. It is succeeded by its sequel, Advance of Zeta: The Traitor to Destiny.