一家惨殺事件の被害者・宝生アイコは、遺体処置室で息を吹き返した！　その左腕に、凶暴な異形を宿して……。あまりにも残酷で、あまりにも切ない運命に翻弄される彼女の明日に、光はあるのか？

Following the murder of her family, a girl named Aiko wakes up in a lab to discover that her own arm has been replaced by one from a hideous and powerful monster—and the arm has a will of its own! Agents from Aethos—a mysterious, government-linked corporation—want to use the power of Aiko's demon arm to fight the deadly creatures known as Chimeras, whose attacks on the civilian population are increasing. But Sudo, the agent who has befriended Aiko, isn't so happy about this development. In helping them to defeat this enemy, is she becoming an even greater threat herself?

Following the murder of her family, a girl named Aiko wakes up in a lab to discover that her own arm has been replaced by one from a hideous and powerful monsterand the arm has a will of its own!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.

Hosho Aiko should be dead. To be precise, when she came back home one day, she found her entire family slaughtered by a grotesque monster. The creature attacked and killed her as well, but she finds herself awakening in a mysterious room, taken care of by Dr. Kochigawa. She has amnesia, but when another monster appears before her in her room, she regains her memories and her left arm changes into a powerful weapon, very similar to that of the monster, which she destroys.