At the end of the 21st century, the discovery of a new energy source called DG energy (short for divine grace energy) has revolutionized Earths economy and allowed humanity to colonize space. However, when the initial expedition reaches Pluto, they are attacked by a mysterious, giant life-form known as Nergal.

The Earth Alliance Army fights back by creating an AG Unit using ancient robot weapons known as the Gs Frame which were excavated from archaeological sites all around the world. Girls with special qualities known as Ancient Girls can pilot these robots against the Nergal. However, the first AG Unit suffers heavy casualties in the Jupiter Trojan campaign, and the pilot of Unit 04, Minamiya Reiu, goes missing-in-action...

Years later, Minamiya Reika, the younger sister of Reiu, enlists with the AG Unit to search for her sister and to protect the Earth from the Nergal. A story of friendship, ancient robot weapons, and battles to the death with the Nergal ensues.

(Source: Crunchyroll News)