Far in the future, the resources of Earth have become insufficient, its ecosystem long ago changed irrevocably by a passing meteor. Humankind has divided into two: the people who have escaped Earth and relocated to the space colony, 'Orbital Arc,' and the others who have remained on Earth in a facility called ‘The Shelter.’

When the people of The Shelter cut all supplies to Orbital Arc, humankind commences a bold experiment to grant one last hope for humanity. A young sword-wielding warrior named Age falls down from orbit to Earth. Accompanied by his floating android, Helvis, he must find the indispensable key to the survival of humankind...