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 (good guys) and was approved to be a commander of GR1. Thus his battle has begun against GRO (bad guys) and creates a lot of dramas. Before long, Giant Robo of the 21st century will ask the world the true meaning of its power.

Shuurei Kou and her friend Eigetsu To, a boy prodigy of humble origins, have been appointed co-governors of the Sa province, one of the eight provinces in Saiunkoku. Together, they decide to make the province an academic research center in the hopes of bringing a long overdue prosperity to the region. However, while Shuurei goes to the capital to obtain approvals for the ambitious project, the Sa province's recently established tranquility is threatened by a pandemic that brings both death and turmoil as it begins to spread among the people. Counting on Eigetsu to monitor the situation until her return, Shuurei seeks support from her allies to find a suitable treatment. Yet, Eigetsu's past personal conflicts distract him, providing an opportunity for opponents of Shuurei's position to take advantage of the troubles and undermine her authority. Becoming a government official has been Shuurei's lifelong dream, but it is no easy task for the first woman undertaking such a position. Will she step up and overcome this great challenge or give in to the looming adversities?

A special episode aired after ep. 490, it summarizes the history of confrontation with the black organization.

The universe has fallen under the cruel military rule of the despotic Ventika empire. However, a rebel police state planet known as G.P.P has discovered the existence of a little girl called Muma, that could well hold the key to bringing down the Ventika empire once and for all. Despite her frightening potential, Muma is suffering from memory loss and is incarcerated in a maximum security prison. Charged with the assignment of busting Muma out and protecting her, the G.P.P send one of their most hardened elite, Agent Kate. Upon completing her mission successfully, Agent Kate is assigned yet another mission immediately after. This time, she must rescue another person that will prove instrumental in overthrowing the empire. His name is Bavi Stock, a young man of incredible talent but the problem is he that he too is currently incarcerated on the Ventika's purpose built prison planet. Can Agent Kate break him out? And just what can this Bavi Stock do? Bavi Stock is a 2 part OAV series. The first movie is called "Bavi Stock 1: Endless Target" and the sequel was called "Bavi Stock 2: The Revenge of Eyesman".