"Ergo Proxy: Centzon Hitchers and Undertaker" is a manga series that expands on the universe of the original "Ergo Proxy" anime. The narrative is set in a dystopian future where humanity survives in domed cities, shielded from a toxic environment. The story revolves around the coexistence of humans and AutoReivs, humanoid robots designed to assist society. However, a mysterious phenomenon called the Cogito Virus begins to infect AutoReivs, granting them self-awareness and leading to unpredictable behavior.

The protagonist, Re-l Mayer, is an investigator working for the Citizen Information Bureau in the domed city of Romdo. Tasked with uncovering the truth behind the Cogito Virus, Re-l encounters a series of unsettling events that challenge her understanding of reality. Her investigation leads her to cross paths with Vincent Law, an immigrant with a mysterious past, and Pino, a child-like AutoReiv infected with the Cogito Virus. Together, they uncover deeper conspiracies involving the Proxies, god-like beings with immense power and enigmatic motives.

As the story progresses, the trio ventures beyond the confines of Romdo, exploring the desolate wasteland outside the dome. They encounter various factions, including the Centzon Hitchers, a group of rogue AutoReivs, and the Undertaker, a shadowy figure with ties to the Proxies. The narrative delves into themes of identity, free will, and the nature of humanity, as the characters grapple with their own existential questions and the consequences of their actions.

The manga maintains a dark, atmospheric tone, with intricate world-building and a complex plot that intertwines philosophical inquiry with action and mystery. Re-l’s journey is central to the story, as she evolves from a skeptical investigator to a key player in the unfolding events. Vincent’s struggle with his identity and Pino’s innocence amidst chaos add emotional depth to the narrative. The series explores the blurred lines between human and machine, reality and illusion, and the ethical implications of artificial intelligence, all while keeping readers engaged with its suspenseful and thought-provoking storyline.