In an incident a few years ago, a perverted doctor turned the abducted children into out-and-out "mutated corpses". Everyone was struggling in hell, hoping to see the light again one day...
The girl codenamed: Zero (Zero) is the doctor's original experimental subject and his favorite masterpiece.
The mutated physique will gradually erode the children's hearts and one day they will turn into out-and-out cold-blooded animals. However, Zero retains the original heart of a human being. No matter how much suffering she suffers, she will not lose herself.
Zero: "Everyone, I will definitely rescue you!" A new future is waiting for us.