In future Tokyo, a young woman in the privatized police force tracks down her father's killer while battling against mutant rebels known as engineers.
Yuki lives at home in peace until one day a unit of assassins breaks in and kill her mother. In order to revenge herself Yuki becomes a demon of vengeance by donning gothic lolita clothing, using a parasol as a deadly weapon, and executing the guilty in God's name.
A reconstructed girl is created from the pieces of a vampire girl's mini-butchery. Slaughter abounds as both of them pursue the same boy.
