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)

The greedy samurai lord Daigo Kagemitsu's land is dying, and he would do anything for power, even renounce Buddha and make a pact with demons. His prayers are answered by 12 demons who grant him the power he desires by aiding his prefecture's growth, but at a price. When Kagemitsu's first son is born, the boy has no limbs, no nose, no eyes, no ears, nor even skin—yet still, he lives. This child is disposed of in a river and forgotten. But as luck would have it, he is saved by a medicine man who provides him with prosthetics and weapons, allowing for him to survive and fend for himself. The boy lives and grows, and although he cannot see, hear, or feel anything, he must defeat the demons that took him as sacrifice. With the death of each one, he regains a part of himself that is rightfully his. For many years he wanders alone, until one day an orphan boy, Dororo, befriends him. The unlikely pair of castaways now fight for their survival and humanity in an unforgiving, demon-infested world. [Written by MAL Rewrite]

Meet the Demon Patrol: a hotheaded demon prince; a sultry, half-naked ice princess; a lusty frog-demon spy; a talking wizard hat... and one little girl. This rag-tag group has been charged with the protection of Earth from a multitude of demons who would love nothing more than to bring their world crashing down around them. They'll face off against a vengeful squid, a somnambulant kitty cat, a pot full of snakes, a night-stalking deciduous, a hater of crotches, and even a literal butthead! Descend into an unreality filled with pratfalls, lewd behavior, and enough obscure cultural jetsam to drown us all! (Source: NIS America)

To aid his conquest of Japan, the ruthless lord Daigo Kagemitsu offers to sacrifice his soon-to-be-born son to 48 demons. The demons accept, and the next day, the child is born with several missing limbs and is ruthlessly cast down a river. Fifteen years later, a stubborn young boy named Dororo struggles to survive against hunger and oppressive samurai on the streets of an impoverished and war-torn village. After angering a group of thugs, Dororo is attacked by them, but a mysterious man interrupts them, claiming to hear spirits nearby. Sure enough, a monster emerges from the river, and the man then removes his prosthetic arms, revealing blades hidden underneath, with which he slays the monster before leaving. That night, as the man walks through the forest, Dororo approaches him and declares that he will accompany him. From this, the man, Hyakkimaru, reveals that many of his body parts were stolen by demons and that though he sought a peaceful life, he couldn't escape their relentless onslaught. Despite the tale, Dororo still insists on tagging along. And thus, Hyakkimaru travels through Japan with his new companion and a puppy named Nota, facing the brutality of both hell and mankind. [Written by MAL Rewrite]