Yieney and Zieney

These two twin warrior women were raised by their uncle after their parents' deaths at the hands of a ruthless killer affiliated with the mob. Their uncle taught them martial arts, and over time, they became true Shadow Warriors. The day came when their uncle died from unknown causes, though it was believed that he died simply of a rare brain condition that affects one's mind for the worse. The women eventually inherited the dojo of their late uncle and became female senseis there. Over time, the day came when they finally avenged their parents and defeated the mob boss and his henchmen, ending his reign of terror for good. It was actually revealed later on that their uncle's death actually came from a horrible neurosomatic viral infection that sometimes would cause whoever was infected by it to turn into a literal zombie, but their uncle had died and was safely buried in a cemetery before a full undead transformation could occur (he sought out medical treatment through the use of psychotropic drugs combined together with antiviral medications). A small zombie apocalypse started to affect the city near the women's dojo, so the women have taken it on themselves to prevent tragedy from striking where it ought not. They have become the angels of their city, albeit somewhat surreptitiously.