The Demon Ororon Series by Mizuki Hakase

An impure angel and the youngest son of the Lord Devil join forces when they are ostracized from their respective celestial realms.

Ororon has promised Chiaki that he won't kill, but what will his promise cost? Lika, Shiro and Chiaki herself are beset on all sides by bounty hunters while a severly injured Ororon struggles with his new mandate despite his overwhelming impulse for murder. Even if he gives into his bloodlust to save his new family, will the guilt-ridden devil be able to face his half-angel with so much death on his hands?

The orphaned daughter of the Archangel Michael must team up with an unholy devil in a struggle to stay alive as the battle between devils and the angelic order rages around them.

While Othello and his Blue Dragon Army face down the bounty hunter Mitsume and the Devil Oscar's forces, Oscar himself finds Ororon and his brood. Oscar has been trying to assassinate Ororon this entire time, fearing his younger brother's power and possible desire to ascend to the throne of hell. This time there is no escape and Oscar, insane with hatred and thirsty for pain, proceeds to murder Ororon very slowly, torturing the poor lovesick Chisaki who can only stand by and watch... moreWhile Othello and his Blue Dragon Army face down the bounty hunter Mitsume and the Devil Oscar's forces, Oscar himself finds Ororon and his brood. Oscar has been trying to assassinate Ororon this entire time, fearing his younger brother's power and possible desire to ascend to the throne of hell. This time there is no escape and Oscar, insane with hatred and thirsty for pain, proceeds to murder Ororon very slowly, torturing the poor lovesick Chisaki who can only stand by and watch. Chisaki's friends attempt to attack Oscar to allow Chiaki time to escape, but to no avail. They fall at the hand of the powerful devil. But just as Oscar turns his fury to Chiaki herself, Ororon musters all his remaining power to summon a beast to kill Oscar before falling over dead himself before Othello could even arrive with his own army. less