Grendizer follows the adventures of Duke Fleed, the prince of Planet Fleed, who, 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.

Manga adaptation of the anime made by Yuu Okazaki at the time and only in 2012 it was republished in other format.