Z Island, the southernmost tip of Japan. Miwako, an investigator, comes to this island alone in pursuit of a series of disappearances of high school girls on the mainland. They were greeted by Oki, a local investigator, but perhaps because of the slow flow of time on the island, Oki didn't seem nervous. Meanwhile, Oki warns Miwako, who immediately gets excited about the investigation. ``This is a scary island. It would be better for your own safety if you listened to what I have to say...'' Miwako, feeling uneasy about these words, begins her investigation in the downtown area at night. Ma