Tokyopop was one of the first manga publishers to find success in BL manga, first with their release of FAKE and Gravitation and later on through their Blu imprint with like Junjo Romantica. Sadly, nothing everything out of Blu was a winner.
INNOCENT BIRD (Na Mo Naki Tori No Tobu Yaoke), by Hirotaka Kisaragi. First published in 2002 and first published in North America in 2007.
While the endless war between angels and devils rages on, Shirigasi strives to become a holy man. Once he had been Satan's favorite concubine, but now he wants to become human. To do this, he must not only forsake his demonic nature but must find something precious enough to trade with God himself to achieve his dream. Along the way, he meets with Karasu. He's an angelic investigator who finds himself increasingly charmed by Shirigasi. As the two of them fall in love, they must fight back against the forces of both Heaven and Hell who seek to punish them for disobeying the natural order of their world.