Majin Tantei Nougami Neuro E 3

Because of this, he makes a permanent deal with yako katsuragi (who has her own personal mystery she has to solve), and together they solve crimes for neuro's appetite. The series focuses on neuro nougami, a demon who feeds on mysteries and puzzles, who comes to the human world to feast on the mysteries offered by humans who release negative energy from their planned crimes.