Both Chiaki and Ororon have been ostracized from their respective celestial realms ? Chiaki because she is an impure angel and Ororon because he is the youngest son of the Lord Devil and therefore a threat to his older brothers for leadership of the underworld. As various demons come by to eat the angel Chiaki, she learns that having the incredibly powerful Ororon by her side is useful. However the difference between angel and devil becomes clear when Chiaki has to implore Ororon not to kill those that come to threaten them. Meanwhile, Chiaki's household grows even more when she invites Lady Miss Lucy, the demon cats Shiro and Kuro, her friend Rika, and Ororon's brother Osero to come live with her as well.

Ororon
The youngest son of the Devil Lord Oz.

Chiaki
A half-angel daughter of the Archangel Michael and a human woman who has been ostracized from heaven because of her impurity of her parentage. Her closest relative, her grandfather, has recently died, leaving her alone in the world save for one friend, Rika. Now many of the spirit world want her dead, forcing her to remain indoors, in hiding.

Lady Miss Lucy
A housekeeper and cook brought into Chiaki's home by Ororon, who is not impressed with the angel's cooking.

Shiro & Kuro
Two demon cats.

Rika
Chika's last remaining friend and ally.

Osero
Ororon's brother.

Three Eyes
A bounty hunter recruited by Osero to be a part of the Blue Dragon Army that he leads. However, a rocky past between the bounty hunter and the devil may pit the two against each other.

Mashu
Ororon's best friend.

Jano
Leader of a bounty hunting group after Ororon.

Oscar
Another of Ororon's brothers - he feels that killing his youngest sibling will ensure his own ascension to the throne of hell.

Mizuki Hakase
Hakase-san is a frequent contributor to the Japanese manga magazine Wings in which she has published 3 series, Akuma no Ororon (The Demon Ororon), its sequel Mayonaka no Teikoku (Empire of Midnight), and a short story called Asian Beat which spawned a sequel, Asian Beat: Kizu.

She has also published Maybe Blue for D+ Magazine, which specializes in shounen-ai material. Her current work, Baku, is currently running in Wings.