Genseishin
The Justirisers mecha are stored within the Storage Satellite Shadestar, a spaceship Noulan created to support Earth. Though normally in Earth's orbit, the Shadestar enters Earth when Ryuto is invoked, during Daruga's attack on Riceross and the Seishinjuu, and finally fighting Kurogane before it is destroyed.
Read more about this topic: Genseishin Justirisers