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Neuro Nōgami is a hell-born demon who feeds on "puzzles". Having devoured all of the Demon World's mysteries, decides to come to the Human World to feast on the puzzles offered by Humans, filled with negative energy from their planned crimes and forbidden emotions. As a demon, he must not make his presence noticed by the humans, and thus forms a partnership with the human Yako Katsuragi, making her act as the real detective while Neuro can go unnoticed as the assistant. Together they run a detective office in search of the Ultimate Mystery that will satiate Neuro's hunger.