As seventeen-year-old heir to the Tsukioka family and a bankrupt weapons company, the game introduces a world where all manned space exploration projects have been put on hold indefinitely due to a material called "Space Nectar" that poisons and kills any organic life in space.
When machines known as Volgara begin destroying the earth, the player, as the sole inheritor of the Tsukioka's weapons company, must pilot the only weapon on Earth capable of standing against a Volgara.