Majin Tantei Nougami Neuro E 18

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. 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.