Ancient G's Frame

is a Japanese-Chinese original net animation series by Seven Stone Studios. The Chinese version premiered on local streaming platforms like Youku Tudou and Bilibili on October 11, 2021, while the Japanese version premiered on Japanese television on Tokyo MX the following day. The series is licensed in North America by Funimation.

Plot
The discovery of a new energy source called "DG energy" (short for "Divine Grace energy") has revolutionized Earth's economy and allowed humanity to colonize space. However, when the initial expedition reaches Pluto, they are attacked by a mysterious aliens 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, Reiu Minamiya, goes missing-in-action...

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