Mr. Okajima is a student caught up in a myriad of events. One of the most prominent being the deaths of many surrounding the very school he attends. He's become caught up in what seems to be the enigmatic individual who's determined to stop the murders. She's a loner, and her name is Yua. His teacher however, has different plans for the both of them, and when she finally gets her hands on them, "cats got your tongue" won't be the phrase to describe what this she-devil does!