Dororon Enma-kun

It's Tokyo in the 1970s, and evil youkai (goblins) are attacking the human world. The "Youkai Patrol" - Enma, Princess Yukiko, Kapaeru, and Grandpa Shappo - are sent from hell to exterminate them.

Enma is a character created by the genius manga artist Go Nagai. Now, the popular character makes his appearance in an alluring Japanese horror anime for adults. It's a hair-raising erotic suspense in which Enma takes on complicated and gruesome incidents caused by demons who lurk in the darkness. But humans have lit up the darkness of the night with neon lights and turned their world into one that never sleeps, so demons now lurk in the "darkness of the human heart." Unfulfilled hearts, suppressed hearts, despair,...such darkness of the heart is the place they lurk. Enma is the Demon Prince of the Underworld, a demon "Born of Fire." His mission is to take back or destroy demons that have escaped to the human world from the Underworld. Along with his partner, Princess Yukihime, "Born of Ice," and the monster, Kapaeru, Enma sets up "Enma's Detective Agency." Tonight, like any other night, they will roam the sleepless city. Horrific incidents that could not possibly be human acts occur one after another. The stench of evil lingers at the scene... Enma's fire rips through the darkness!

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.

Three monsters, Bem, who looks like a gangster, Bero, who looks like a boy, and Bera, a witch, act as agents of justice, hoping that they will be allowed to become human. Several episodes involve them protecting a young boy. The style of animation is fairly distinctive, and the storylines not without interest.