Depending on the game by Black Lilith.

People transferred to space, public order and security was maintained through the space federal managed by various species including humans. Charge character Iris and her partner Mei Ling include the ace pilots in the 101 special unit, from federal army SSF. During one of many battles, Iris is captured introduced towards the whorehouse on Mirion, an urban area ruled with the enemy forces. She's forced to get a devil's collar around her neck which fills up if she tries to escape.