A crossover sequel light novel, which focuses on the unused concept of the series, was released on Sunrise's Yatate Bunko imprint on September 30, 2016.
The series is set in 2007, two years after the Gutsy Galaxy Guard thwarted the invasion of the Zonders, and Mamoru and Galeon departed for the Tri-Solar System.
Gai is now working with Renais-Kardif Shishioh and biologist Papillon Noir to reclaim one of the Q-Parts from BioNet using the GaoFighGar, GGG's newest trump card.
The series is set after the events of the original series, featuring new and returning characters and those from other GaoGaiGar media, including Mamoru and Galeon and the first anime appearance of Renais Kerdif-Shishioh, Gai's cousin from the GGG's sister organization Chasseur, as depicted in the novel "Queen of Leo
It forms the core philosophy of Planetary Master Palpalapa, who believes that when two great powers clash, the victor becomes God and the vanquished becomes the Devil.
The dualist nature of GaoGaiGar suggests there is a god or goddess of protection, who is implied to be Mikoto Utsugi, an invincible life-form formed from the remnants of Zonder Metal's power.
Starting in April 2005, a twelve episode "re-imagining" of the series, GaoGaiGar Final: Grand Glorious Gathering, aired on TV Tokyo.
[4] The story takes place 8 years after the events of the OVA, focusing on both Mamoru and Kaido and the newly formed Gutsy Global Guard as they battle against the threat of Triple Zero, known also as The Power.