Toushinki G's Frame

By the end of the 21st century, the development of a new energy source, DG energy, transforms Earth's economy and enables human space colonization. A first mission to Pluto encounters a massive unknown entity called Nergal. In response, the Earth Alliance Army constructs AG Units using ancient robot weapons, the G's Frame, recovered from global archaeological sites. These machines are operated by individuals known as Ancient Girls, who possess unique traits. During a campaign in the Jupiter Trojan, the first AG Unit incurs significant losses, and the pilot of Unit 04, Minamiya Reiu, vanishes. Later, Minamiya Reika, Reiu's younger sister, joins the AG Unit to locate her sibling and defend Earth from Nergal. The narrative follows themes of friendship, ancient weaponry, and deadly confrontations with the Nergal.