It is based on the manga version with unique refinements. It was mass-produced, and during the Lunar Invader War, three units were used - Nagare Ryuma's Getter 1, Jin Hayato's Getter 2, and Tomoe Musashi's Getter 3 - and they won the war on the Moon.
When Ryuma was sent 13 years into the future after the True Dragon Explosion Incident, he modified the Getter 1 that had been discarded at the lunar base when he was sent to the Moon into the Black Getter, and returned to Earth.