Monsters are coming to the human world from the Hell in order to get human spirits. As people's minds are getting dirty, being attracted by the dirty spirits, the monsters break the rule to go to the human world. 
Tsutomu, a boy who goes to Yokai Elementary School, is suddenly assaulted by monsters. Those who save him from the monsters are Enma-kun, the son of Enma, Yukiko, a snow woman, and Kapaeru. They are members of Monster Patrol that are sent to the human world to arrest monsters. 
(Source: AnimeNfo)

Emma-kun, Yukiko Hime, and Kapaeru are members of a Demon Patrol that are sent to the human world to arrest demons.
 
(Source: Anime News Network)

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!
 
(Source: Bandai Entertainment)

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.
 
(Source: Anime News Network)

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