"Mobile Suit Zeta Gundam Define" is a manga adaptation and reimagining of the original "Mobile Suit Zeta Gundam" anime series, written and illustrated by Hiroyuki Kitazume. The story is set in the Universal Century timeline, seven years after the events of the One Year War. The Earth Federation and its elite military force, the Titans, have become increasingly authoritarian, oppressing spacenoids and dissenters. In response, the Anti-Earth Union Group (AEUG) emerges as a resistance movement fighting against the Titans' tyranny.

The protagonist, Kamille Bidan, is a young and talented mobile suit pilot from the space colony Green Noa. Kamille becomes entangled in the conflict after a confrontation with Titans officer Jerid Messa, leading to his involvement with the AEUG. Kamille pilots the advanced RX-178 Gundam Mk-II, stolen from the Titans, and later the powerful MSZ-006 Zeta Gundam, a transformable mobile suit designed by AEUG engineer Anaheim Electronics. His journey is marked by personal growth, as he grapples with the moral complexities of war and his own emotional struggles.

The narrative explores the ideological clash between the Titans and the AEUG, with key figures such as AEUG leader Quattro Bajeena (the alias of Char Aznable, a veteran of the One Year War) and Titans commander Paptimus Scirocco playing pivotal roles. Char serves as a mentor to Kamille, advocating for spacenoid independence, while Scirocco manipulates events to further his own ambitions. The story also delves into the lives of supporting characters, including Emma Sheen, a former Titans officer who defects to the AEUG, and Four Murasame, a cyber-Newtype whose tragic connection to Kamille adds emotional depth to the plot.

The manga expands on the original anime's themes of war, identity, and the consequences of technological advancement, particularly through the exploration of Newtypes—individuals with heightened spatial awareness and empathy. Kamille's evolution as a Newtype is central to the story, as he struggles to understand his abilities and their implications. The manga also introduces new subplots and character interactions, providing a fresh perspective on the events of "Zeta Gundam" while maintaining the core narrative.

"Mobile Suit Zeta Gundam Define" balances intense mobile suit battles with character-driven drama, offering a nuanced portrayal of its ensemble cast. The manga's reinterpretation of the source material enhances the original story, making it a compelling entry in the Gundam franchise for both new readers and longtime fans.