Kanata and his friend Tokiji are ordinary teenagers in modern Japan. Mysterious deaths have begun to occur in their city, where the victim head will transform into an animal face and explode. There are rumors about these strange incidents, but one day it happens at Kanata school. Kanata is caught up in the incident and gains the special ability to "remove his limiter". This allows him to greatly enhance a single ability of his, but after he uses it, another ability will go out of control. He encounters a mysterious, beautiful woman in a black skin-tight combat suit named Shiki. She forces Kanata and Tokiji to become deeply involved in these incidents. Just what is going on? What mysterious organization is behind this!? A world-spanning conspiracy begins to unfold.