Akuma-Kun (devil's child) is a young boy who teams up with Mephisto, an old pointy nosed Tuxedo wearing demon who has a bump on his head. They are both working for Dr. Faust, who control Mephisto by using the solomon's flute. They battle monsters and ghosts.
Shingo Umoregi is a boy in fifth grade. He was nicknamed “Akuma-kun” by his friends due to his immense knowledge of demons and the occult. According to Faust, Shingo is said to be the Messiah, who appears once every ten thousand years to bring peace to the world.