Nephilim Vol. #01
http://www.animeondvd.com/reviews2/manga/manga.php?manga_view=4394
5/13/2008
"Excerpt: Nephilim - a unique race that turns male by day and female by
night. Labeled as "Gods of Death," it is said that whoever glances
upon their bewitching night beauty will meet with certain death.
Unfortunately for the playboy imperial soldier Gai, such an occurrence
earns him a beautiful angel of death named Abel hellbent on taking his
life."