Rune Balot survives on Mardock City's streets as a child prostitute until casino manager Shell Septinos takes her in, then tries to kill her to cover his crimes. Dr. Easter saves her and rebuilds her as a cyborg with heightened senses and the power to manipulate electronics, working alongside a small shapeshifting mouse named Oeufcoque. Backed by that new power, Balot sets out to make Shell answer for what he did to her.