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)

When Mr. Sato, a company employee at the worlds largest electrics company, is called upon by his Boss to tutor his only son in exchange for a high ranking position within the organization, things couldn't have been peachier. 
At least, that's what he thought... 
Little did he know that his student to be was Ichiro Matsushita, a young boy with the mind of a genius and a terrifying hidden agenda. 
It doesn't take long for Sato to realize that he is the second home tutor in as many weeks that has been sent to teach the little boy. What's even more unnerving is that the previous Tutor's whereabouts appear to be a mystery... 
The little boy's true identity is revealed when he puts Sato under a curse, turning him into a lizard man and making him one of servants. 
Little Ichiro Matsushita is none other than "Akuma-kun" boy genius and master of black magic. His goal? to open the portal between hell and earth, summon forth hell's most powerful demons, and enlist their help in taking over the world!

The age of the demons has begun. Dr Faust has foreseen this rise of evil. Unfortunately, he is near death and is unable to personally battle this upcoming threat. Faust entrusts a young boy, Shingo Yamada, to take the responsibility of ridding the Earth of this new evil presence. Faust finds a birthmark on Shingo's forehead that signifies that he is the chosen demon fighter. Faust summons from hell what may be humanity's only hope of surviving: a less than enthusiastic devil named Mephisto rises. After signing a pact in blood to save humankind, Shingo and Mephisto set out to battle the supernatural world. 
(Source: AniDB)

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