Z9 City is the center of the Zenith Colony — a cluster of space stations far from the troubles of Earth. Tran and Bobby have grown up here, going to school, learning to fly spacecraft, meeting girls, dealing with imperfect parents, exploring the massive city. A sudden catastrophic event thrust the boys into a dark reality. With the support of a brilliant scientist, and the care and special training from a mysterious renegade woman from Earth, the two boys face the future with renewed hope and purpose. But trouble has come to the Zenith Colony, and they soon find themselves in a struggle between good and evil, life and death. Guided by a fierce sense of loyalty, Tran and Bobby strive to protect their colony, their way of life, and the ones they love, not knowing if it will be enough.