Pluto Vol 3

From the VIZ Media edition

When robots become so highly advanced in function, yet so similar in kind to humans, societal resistance is inevitable. In this backdrop of technophobic discrimination, Europol's top robot detective Gesicht and Atom, the most advanced robot in the world continue their investigation into the serial murders of the great robots of the world. The leaves of this mystery masterfully unfold into a complex intersection of reactionary robot hate groups, global politics, and an exploration of robot identity.

Source: Anime News Network Encyclopedia