Following the murder of her family, a girl named Aiko wakes up in a lab to discover that her own arm has been replaced by one from a hideous and powerful monsterand the arm has a will of its own! Agent SudoAikos allytries to uncover the secret behind Aethos, the government linked corporation in charge of investigating the deadly Chimeras.But in doing so, he stumbles upon a secret from his own pasta girl he believed he had killed years ago, but who instead has been a subject of experimentation.As for Aiko, shes having doubts about just what the Chimeras really are and may be losing the will to fight them.