Ben and his new wife Jane leave New York for Tokyo, Japan, where Ben has a job as a photographer. They start to find mysterious lights in their photos. Ben's assistant takes them to her boyfriend, who says that the lights are spirits and then finding a mysterious presence stalking them. They then go to a psychic, Murase; however, Ben refuses to translate what Murase says.
Later on Jane decides to visit the office building in the photo. When she gets there, she goes to the floor where the light has gathered, and takes pictures in the empty office. She encounters the spirit, and learns that the girl's name was Megumi Tanaka and that Ben knew her. When she confronts Ben about it, he admits that he and Megumi were once involved in a relationship, but that she was very obsessive and clingy. Jane is upset with Ben and decides they need to find Megumi.
They go to Megumi's home, only to find her decayed body; she had committed suicide. Meanwhile, Ben's friends, Adam and Bruno, are killed by Megumi. Adam's eye is torn out while shooting pictures; Bruno commits suicide. Finally, Ben is attacked by the ghost of Megumi. Jane in desperation yells, "He didn't love you!" Megumi stops, leaving Ben alive.
After Megumi's cremation Ben and Jane return to New York, thinking it's all over. However, Jane finds some recent photos in an envelope which still show Megumi. She then finds more photos showing Ben, Adam, and Bruno forcing themselves on Megumi. Realizing that Megumi was trying to warn her, Jane leaves.
Angered, Ben begins photographing the apartment looking for Megumi, but finds Megumi sitting on his shoulders. In an effort to rid himself of her, he electrocutes himself. He is rendered completely catatonic and sent to a mental institution. The last scene is a reflection of the glass from the door, showing Megumi still with him.