Synopsis
People have moved to space, and public order and security are maintained by the Space Federation, which is managed by various species, including humans. The lead character, Iris, and her partner, Mei Ling, are the ace pilots of the 101st Special Unit, belonging to the federal army SSF. During one of the battles, Iris is captured and taken to a whorehouse on Mirion, a city ruled by enemy forces. She is forced to wear a devil's collar around her neck, which will explode if she attempts to escape.