"Jūki Ningen Jumbor" is a science fiction manga series set in a dystopian future where humanity faces extinction due to environmental collapse and the rise of genetically engineered superhumans known as Jumbors. These Jumbors, created by the mysterious organization GGG, possess extraordinary abilities and are designed to replace ordinary humans. The story centers on Jumbor 13, a unique prototype who retains human emotions and memories, setting him apart from other Jumbors.

Jumbor 13, also known as Jumbor, is discovered by a group of human survivors led by a young woman named Sara. Sara and her companions are part of a resistance movement fighting against GGG's oppressive rule and the spread of Jumbors. Jumbor 13's human-like qualities make him a key figure in the struggle, as he grapples with his identity and purpose. While initially seen as a weapon, Jumbor 13 gradually develops a sense of morality and empathy, aligning himself with the human resistance.

The narrative explores themes of identity, humanity, and the ethical implications of genetic engineering. As Jumbor 13 fights alongside the resistance, he encounters other Jumbors, each with their own motivations and struggles. Some Jumbors, like the ruthless Jumbor 9, serve GGG without question, while others, such as Jumbor 7, begin to question their existence and role in the world. The conflict escalates as GGG unveils its ultimate plan: to eradicate humanity entirely and replace it with a new race of perfected Jumbors.

The series delves into the complexities of the characters' relationships, particularly the bond between Jumbor 13 and Sara. Sara's unwavering belief in Jumbor 13's humanity serves as a catalyst for his growth, while Jumbor 13's actions inspire hope among the resistance. The story also examines the broader societal implications of GGG's actions, highlighting the consequences of unchecked scientific advancement and the dehumanization of individuals.

As the resistance gains momentum, Jumbor 13 becomes a symbol of hope for both humans and Jumbors alike. The final arc of the series culminates in a climactic battle between the resistance and GGG, with Jumbor 13 confronting the organization's leader and the origins of the Jumbor project. The resolution of the story addresses the fate of humanity, the future of the Jumbors, and the possibility of coexistence between the two. Through its exploration of identity and morality, "Jūki Ningen Jumbor" presents a thought-provoking narrative that challenges the boundaries of what it means to be human.