Akuma Kun, a boy raised by a demon, works with his half-human partner Mephisto III as paranormal investigators to solve various murder and mysteries.
Episode 1
A university student asks Akuma Kun to investigate the strange deaths of two of her friends, who both died on the same exact date and time.
Episode 2
Hina looks after Ichika, but danger still lurks nearby. Akuma Kun further investigates the case by making another visit to the Asanagi house.
Episode 3
Akuma Kun and Mephisto III get invited to the home of a very wealthy client, who has a disturbing request — to summon Satan for his flesh.
Episode 4
A famous movie director in his twilight years asks Akuma Kun and Mephisto III to find a long-lost, cursed film made by his dear friend.
Episode 5
At his wit's end, a landlord breaks into the apartment of a tenant who stopped paying rent — and discovers a gruesome, seemingly impossible murder.
Episode 6
After arriving in Easter Island to investigate a strange red nail, Akuma Kun and Mephisto III discover the body of a murdered young woman.
Episode 7
After years of hard work, a long-time legislator is on the verge of becoming a Cabinet minister. But then, a threatening man pays him a visit.
Episode 8
A little boy goes into the Millenarianism Research Institute saying he wants to become a demon, but Akuma Kun immediately throws him out.
Episode 9
On a dark and stormy night, a ghastly looking man comes looking for Sanae. He turns out to be her husband, who's been missing for five years.
Episode 10
While trying out the pancakes at a new neighborhood restaurant, Mephisto III and Akuma Kun remember the day they first met.
Episode 11
When Shingo — aka the first Akuma Kun — is sealed away, the father and son Mephistos set out to rescue him, while Akuma Kun takes a different approach.
Episode 12
Akuma Kun, Gremory and Mephisto III enter the barrier to save Shingo. But first, they'll have to confront Strophaia, an old enemy from Ichiro's past.
