"Sunabozu," also known as "Desert Punk," is set in a post-apocalyptic future where Japan has become a vast desert wasteland. The story centers on Kanta Mizuno, a skilled mercenary known as the "Demon of the Desert" due to his cunning tactics and survival skills. Kanta operates as a handyman-for-hire, taking on various jobs that often involve combat, sabotage, or retrieval missions. Despite his crude and lecherous personality, Kanta is highly resourceful and adept at navigating the harsh desert environment, using his wits and an array of gadgets to outmaneuver enemies.

The narrative explores Kanta's adventures as he encounters rival mercenaries, powerful factions, and remnants of pre-apocalyptic technology. One of his recurring adversaries is the Rain Spider, a mysterious and skilled mercenary who often clashes with Kanta over jobs or personal vendettas. The story also introduces Kosuna, a young girl who becomes Kanta's apprentice. Initially naive and inexperienced, Kosuna gradually develops her own skills under Kanta's reluctant guidance, though their relationship is marked by tension and mutual exploitation.

As the series progresses, the plot delves into the political and social dynamics of the desert world, including the influence of powerful clans and the scarcity of resources. Kanta's missions often intersect with larger conflicts, revealing the fragile balance of power in the wasteland. The story balances action-packed sequences with moments of dark humor and character development, particularly in Kanta's evolving relationship with Kosuna and his interactions with other mercenaries.

Themes of survival, morality, and the consequences of human ambition are woven throughout the narrative, as characters navigate a world where trust is scarce and survival often depends on ruthless pragmatism. The series maintains a gritty, unpredictable tone, with Kanta's morally ambiguous actions and the harsh realities of the desert serving as central elements of the story.