When monstrous creatures from deep space terrorize earth, a chosen group of soldiers called the Ancient Girls become humanity's only hope.

At the end of the 21st century, a world has been invaded by giant space lifeforms called the Nergal. Reika Minamiya joins the anti-Nergal AG unit to find her older sister who is missing-in-action, but then becomes the pilot of an ancient humanoid robot known as "G's Flame." Along with her fellow recruits, she overcomes her anxieties and turmoil as she comes of age.—Anime News Network

When monstrous creatures from deep space terrorize earth, a chosen group of soldiers called the Ancient Girls must protect everyone. Trained to pilot specialized mecha, Gs Frames, these girls are humanity's last hope. Will their sacrifice be deliverance?—Crunchyroll

At the end of the 21st century, the discovery of a new energy source called "DG energy" (short for "divine grace energy") revolutionized Earth's 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 "G's 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.—Bilibili TV