Several centuries have elapsed since the fierce Mobile Suit battles that raged across the universe. Following numerous wars, humanity on Earth lost the ability to advance its own civilization. Some humans migrated to the Moon, where, for an extremely long period, they dreamed of returning to Earth. Once Planet Earth's standard of living recovered to the level of the Industrial Revolution era, Diana Soler, the Queen of the Moon, entered into negotiations with the leader of Planet Earth to allow the Moon Race to return. She also secretly dispatched a reconnaissance unit to assess the environmental and living conditions on Earth. Rolland Seac arrived on Earth as part of this troop. Nearly drowning in a river, he was rescued by two beautiful sisters, Kiel and Sosie. Following the incident, he began working at a mine owned by the sisters' father. He soon grew accustomed to life on Planet Earth. Two years later, the Moon Race, growing impatient with the sluggish negotiations, takes action and attempts to forcefully return to Earth. Flames engulf the streets. The "Turned 'A' Gundam" emerges from the White Doll Ruins, and Rolland finds himself piloting it. He becomes the savior of Planet Earth. Rolland's struggle to prevent war between the Moon and Planet Earth begins.