The September issue of Akita Shoten 's Champion RED magazine published the final chapter of Go Nagai 's Grendizer Giga manga on Saturday. Akita Shoten will publish the second and final volume in Japan on September 18. The final chapter asked fans to look forward to Nagai's next appearance in the magazine.

Nagai launched the manga in Akita Shoten 's Champion RED magazine in September. The story is 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 Uryū. (The main lead of UFO Robo Grendizer was named Daisuke Umon.)

The manga received an animated promotional video in April to commemorate the launch of the first compiled manga volume, as well as Grendizer 's 40th anniversary.