Rin is a seemingly normal Japanese high school girl, but on her sixteenth birthday, everything in her life changes when government special forces break into her home. After witnessing her mother’s face blown into bits and her father’s severed head falling into her birthday cake, Rin’s dormant mutant abilities are awakened: her arm transforms into a sharp, knife-encrusted claw, and a moment later, she finds herself standing in a pool of blood, surrounded by dead soldiers!