"I need someone to describe that description, it makes absolutely no sense to me"
She grew in a house where her father would often walk naked, thus she starts hating men and their disgusting dicks. Since she is cute, men talk to her, but since she hates them, she attacks them earning the nickname "Arisugawa the manhunter". She gets transferred into another world where she became a man and has a dick. The source/culprit of this "evil" is Kuro, a shinobi. Kuro means black in japanese.