Yuragi, demons who depend on human negative emotions for power, have filled the city streets with rape and murder. Ai Kagano, a demon slayer, is hunting them. While hiding undercover in a school as a new student, Ai has to maintain a low profile while searching for the demons. On the other hand, Akitoshi Okajima has an interest on Ai and follows her when he spots her outside school. However, he gets into trouble with the Yuragi, and Ai’s true identity is revealed to him. In revenge, the demons kidnap Akitoshi’s childhood friend, Yua, and his friends to lure both Ai and Akitoshi into their lair to end this chase once and for all.