The Earth is choking in pollution when the alien Rodo strikes, sequestering virtually all the planet's water and vegetation in the guarded enclaves of their titanic vessels. The remaining humans eke out a wretched existence in the vast deserts, under the control of Rodoist soldiers. After witnessing the soldiers' brutality, Ran, a hotheaded adolescent, sets out to join the rebels of the Hazard. During the course of his adventures, he meets Aira, a mysterious girl whose silvery hair marks her as a member of a powerful group needed by the alien Holy Mother to destroy the human race. Can Ran manage to rescue her (and humankind) in the nick of time?