A brilliant robot detective hunts a serial killer targeting his own kind, only to uncover a conspiracy that threatens the fragile peace between humans and robots. Gesicht, a highly advanced robot detective for Europol, is assigned to investigate the murders of powerful robots, including the Swiss robot Mont Blanc and a robot rights activist. As he delves deeper into the case, he discovers a pattern of bizarre collages left at the crime scenes and realizes that he himself, as one of the seven great robots, is a potential target. The investigation forces Gesicht to confront not only the external threat but also a horrifying truth about his own existence and the world he inhabits.

The series is widely praised for its masterful blend of science fiction and suspense, drawing comparisons to classic detective stories. Readers and critics often highlight Naoki Urasawa's intricate plotting and compelling character development, particularly Gesicht's internal struggles. The narrative's exploration of themes such as artificial intelligence, prejudice, and the nature of humanity resonates deeply. The meticulous world-building and the gradual reveal of the conspiracy contribute to a gripping and thought-provoking reading experience.