Although similar in name to the Go Nagai work, this version by Gosaku Outa is vastly different from Nagai's work.

A short manga version of the UFO Robo Grendizer anime. Released along the anime series, UFO Robot Grendizer follows the adventures of Duke Fleed, the Prince of Planet Fleed, whom disguised as Daisuke, a farm worker, fights against the forces that destroyed his planet, the Vegan Empire, also the creators of Grendizer that Duke stole to fight them. While not originaly considered part of the Mazinger series, Koji Kabuto and the Mazinger mechas appear in this series, making it sort of a sequel. Grendizer introduced the concept of a transformable Robot and a space Mecha, concepts that were later taken into other mecha series. It was extremely popular in Japan, Canada, France, Italy and the Arab World and has a strong following in those countries even today. (mangaupdates.com)

The story will be a full reboot of Nagai's UFO Robo Grendizer story. When a great fleet of flying saucers invades Earth, it awakens the true power of Daisuke Uryuu (the main lead of UFO Robo Grendizer was named Daisuke Umon).
 (Source: Anime News Network)

Suddenly, a UAP (Unidentified Aerial Phenomenon) of the Vega Alliance appeared on Earth. Humanity is helpless in the face of Vega's overwhelming military might, but then "Mazinger Z" operated by Kouji Kabuto, and "Grendizer" piloted by Duke Fleed, appear on the scene. Why did Duke Fleed, the prince of the planet Fleed, come to earth? What kind of life did he spend in his homeland?
 
 Note:The story of "The Inception" opens with a prequel that is not told in the TV anime.

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