Li Yuesu drifts alone through space until an accidental discovery: Shangjia, an immigrant ship that vanished years earlier. With it comes a terrifying supernatural event, and slowly people begin to grasp that disaster is approaching. The rival powers of the planet Cornil are finally pushed into an alliance against a mighty foe, but the alien race proves far stronger than anyone anticipated. On the brink of annihilation, Cornil's people send Li Yuesu toward the galaxy's center to ask a powerful human civilization for aid. The twelve-episode ONA blends science fiction and action around an alien threat and a desperate call for help.