10 years ago Dr. Shizuma and his colleagues invented the Shizuma drive which is a revolutionizing new form of renewable and recyclable energy. Though they had to pay a heavy price for their success in a catastrophic accident that the world only wants to forget about. However, all is not well as the secret organization Big Fire is hell-bent on taking over the world. They have obtained two of three mysterious Shizuma drive samples with an unknown function, which are an integral part of their world domination plans. The third sample has however been stolen by Dr. Shizuma who during his escape is saved by Daisaku, Giant Robo and the Experts of Justice. Then a desperate struggle begins between the Experts of Justice and Big Fire for the control of the last sample as Big Fire unleashes their mightiest weapon, the Eye of Volger, upon the unsuspecting world. Soon everything points towards the hidden truth behind the accident 10 years ago as the starting point of everything.
 
(Source: Anime News Network)

In the future, the third energy revolution starts with the invention of the Shizuma Drive and humanity celebrates a new era of prosperity. But lurking is the Big Fire, a secret organization that wants world domination. The International Police combating this threat counting with Giant Robo, a giant robot controlled by just a couple: Daisaku Kusama.


The year is 20XX. Mysterious huge robots called "Giant Robo (GR)" started to appear all over the world and destroy cities. The earth was covered with fear. And their next target is Japan! The hero of this animation Daisaku Kusama, who works in a diving shop, encounters a mysterious girl, simply called V who leads him to make a contract with an enormous robot "Giant Robo 1 (GR1)" at the ancient ruins (Minami Yonaguni Island) in Okinawa. 
He made a contract with UNISOM (main organization) and was approved to be a commander of GR1. Thus his battle has begun against GRO (antagonist organization) and creates a lot of dramas. Before long, Giant Robo of the 21st century will ask the world the true meaning of its power. 
(Source: AniDB)

In episode one, Ginrei's dress is stolen, only to be used to fool the enemy. The second episode deals with a giant robot made exactly in her image. Finally, the third episode concerns Tetsugyu and Ginrei investigating a lost research team in a "wild west" desert setting.


 
(Source: Anime News Network)

An alternate, slightly darker continuity of the Giant Robo OVA, featuring Daisaku Kusama amidst a power struggle between the International Police Organization (IPO) and the Magnificent Ten of Big Fire (BF group).

An adaptation of Giant Robo THE ANIMATION: Chikyuu ga Seishi Suru Hi OVA, serialized in magazine Comic GENKi.

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