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.
Rin a young high school student is your everyday awkward girl who gets bullied by her fellow students. On her 16th birthday, Rin gets an unexpected surprise: she finds out that she is, on her father's side, a half-mutant.
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.
