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]

A remake of Go Nagai's 1973 lighthearted horror anime TV series Dororon Enma-kun.

Kikoushi Enma is a full-fledged horror show, which contains very few lighthearted parts, since it is much more grim and aimed towards adults.

Enma forms together with Yuki-hime and Kappa a team which sends demons back to the netherworld.

[Source: AniDB]

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]