The gods of Japan have been eaten by Oni*(Oni are devil-like demons). The Oni who now hold our lives in the palms of their hands have been searching for the "Out-of-season Flowers" children resulting from the union of Gods and humans. In the midst of this, an Oni called Ushitoru had a fateful meeting with one such child named Masato. After saving his life, Ushitoru steals Masato from his family and takes him away... Now 11 years have passed. With the addition of a young human girl called Nao, the three of them are living life kind of like a family. The most important meeting in their lives-Ushitoru, Masato and Nao have ties to each other stronger than anyone's. (Source: ShoujoMagic)

From Tokyopop:
A lonely yet caring 15-year-old Chiaki, the half-angel daughter of the Archangel Michael and a human woman, welcomes into her home a dejected devil Ororon who pledges to stay at her side forever.
Both of them have been ostracized from their respective celestial realms--Chiaki because her origins are impure 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 agents of heaven come by to destroy the angel Chiaki, she learns that having the incredibly powerful Ororon by her side is useful. And as assassin after assassin comes to eliminate Ororon, he learns that Chiaki can teach him a valuable lesson about the sanctity of life.

From Tokyopop:
In this collection of paranormal short stories, Takeshi Uesugi finds out that he is the reincarnation of the "Baku," a spirit that devours people's nightmares, while Mephist 'helps' ghosts, demons, and other supernatural spirits. Everyone has a past or memory they can't forget in these terrifying tales of the supernatural!