Akuma-kun (ONA)

Akuma-kun is a boy who was adopted and risen by the former Akuma: Shingo Umoregi. He works as a paranormal investigator and solves murder mysteries with the helping hand of his half-human partner Mephisto the Third.
The show, despite being an alternate story, is set to be the adventure of Shingo's "son", therefore, it could be considered as a sequel to the 1989 original
(Source: Netflix)