Akuma-kun (ONA)

Ichiro Umoregi, known as Akuma Kun, runs the Millennium Research Institute, a small consulting office for cases that ordinary logic and police work cannot explain. His partner, the half-human Mephisto III, joins him in investigating murders, curses, and incidents tied to demons and the supernatural.

Ichiro possesses extraordinary intelligence and deep knowledge of the occult, yet he is more mysterious than many of the cases he accepts. Raised apart from his true family, he knows little about his own origins. Each investigation exposes another unsettling corner of both human and demonic nature while drawing Ichiro and Mephisto closer to the secrets of his past, and to the truth behind the name “Akuma Kun.”