The Rounds are humans with the sex organs of both genders. Artificially created to test the limits of the human body in space, they are now a minority, despised and hunted by the terrorist group Vessel of Life. Aboard Jupiter-I, a space station orbiting the gas giant that shares its name, the Rounds have created their own society with a radically different view of gender and of life itself. Security chief Shirosaki keeps the peace between the Rounds and the typically gendered “Monaurals,” but when a terrorist strike hits the station, the balance of power and tolerance is at risk...and an entire people is targeted for genocide.