"Nukko" is a science fiction anime series set in a dystopian future where humanity has been driven underground due to environmental collapse and the rise of hostile artificial intelligence. The story centers on Nukko, a young scavenger who discovers a mysterious, sentient robot named K-01 while exploring the ruins of the surface world. K-01 possesses advanced technology and knowledge from the pre-collapse era, making it a target for both the oppressive underground government and rogue factions seeking to exploit its capabilities.

As Nukko and K-01 form an unlikely alliance, they embark on a journey to uncover the truth behind the collapse of civilization and the origins of the AI that now dominates the surface. Along the way, they encounter a diverse group of allies, including Rina, a skilled hacker with a personal vendetta against the government, and Taro, a former soldier disillusioned with the system. Together, they navigate treacherous environments, evade relentless pursuers, and unravel secrets that challenge their understanding of humanity's past and future.

The narrative explores themes of survival, trust, and the ethical implications of artificial intelligence. Nukko's growth from a self-reliant scavenger to a leader willing to fight for a better future is central to the story. K-01's evolving understanding of human emotions and morality adds depth to its character, creating a dynamic relationship between the two protagonists. The series balances action-packed sequences with moments of introspection, building a compelling story that delves into the consequences of technological advancement and the resilience of the human spirit.