It's a story about Hana Neiomi . a Princess of Neiomi clan, she's also known as Angle of Death or Angel Reaper. When she was just a little girl, there barrio was ambushed by Demons to kill the Angel Reaper in their generation. But the king demon didn't know that the Angel Reaper passed its power to Hana. Little Hana witnessed how her parents die in the hands of a young Demon. Hana is the only survivor of their clan. She pledge in the man of the moon, when the right time comes she will take her revenge.