Neuro Nōgami, the title character of the Majin Tantei Nōgami Neuro series, is a demon detective from hell. He looks for mysteries in the minds of humans for sustenance. When he dismantles the mystery and strips the culprit of all of their defenses, it releases the negative energies that caused the culprit to commit the crime, which he then consumes. He came to the human world in search of the Ultimate Mystery, as all of the mysteries in hell were bland and repetitive. Once in the human world, he forced Yako to be his assistant, and began to solve mysteries. As the series progresses, it seems that Demons have last names that may resemble their overall character or appearance; Nōgami means "Brain Eater".
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