Akuma Kun

The Millennium Research Institute is a counseling office where bizarre requests come in. The head of the research institute, Ichirō Umoregi, also known as "Akuma-kun," is a genius boy who only appears once in 10,000 years. However, he doesn't know his real family. So he, along with his partner Mephisto II, pursues the mystery of his origin while resolving the many mysterious cases handled by the Institute. (GeGeGe no Kitarō Wiki)