The Social Welfare Agency has bred a group of girls that are unlike any other species. They have been created by fusing reconstructed humans with cyber enhancements and taught to be fierce assassins by the government. Triela is a standout among this group of ruthless killers due to her mature disposition and unwavering determination to eliminate her targets. However, she is faced with a formidable opponent in Pinocchio, a male fighter who has been sculpted by the FRF, a Rebel faction fighting against the SWA. With his effortless wielding of sharp blades, he has become a deadly hitman. These beings are tragically conflicted individuals who were once human, but have lost their humanity and replaced it with a cold and unfeeling drive to be the last one standing. Only a few scattered memories of their past lives remain.