When typical Japanese high school student Rika skips school to visit her grandfather, she fails to take into account the fact that his remote village is infested with the living dead.

One day on a holiday, Tatsuya was recording his wife and son playing in the park on his home video camera. However, when he plays back the video, he finds something strange and unfamiliar. The "demon" gradually begins to invade the house.

After a convenience store robbery, three unidentified men hold a group of people hostage in a hospital. Inspector Ishida and Captain Tohno handle the negotiations while one of their colleagues, Lt. Ando, tries to find out why the men decided to take the hospital hostage. Through flashbacks, relevant information is revealed to the audience. When the negotiations are finished, most things seem to be fine until they lose track of the criminals. Then, the story unveils from a different perspective, its roots in feelings of love and vengeance.

In the late-night park, couples entwined—a faint shutter click echoes through the darkness. For Ryoji (Kawai Makoto), hunting for photos to sell for pocket money, they're perfect targets tonight. The next day, Ryōji finds himself suddenly captivated by one such subject. The scandalous woman captured in the shot bore an uncanny resemblance to Shizuka (Ami Minami), the high school teacher he had once admired.