Aiko wakes up on a laboratory table unscathed, despite witnessing her family's massacre. Her moment of relief is short-lived when she discovers an abhorrently disfigured arm attached to her body. This realization dawns upon her that the life she once knew is no more. The arm contains the DNA of Chimera, an enigmatic monster, and acts upon its master's instincts, leaving Aiko defenseless against its desires. Stranded and frightened, how will she cope with this dreadful destiny?