Yusuke moves to a new house to create his dream audio room in a drab basement. His wife, Motoko, discovers an old video camera with footage of a strange woman talking. They realize the video is from their basement, taken at the time they've already moved in. To investigate, they set up a hidden camera and leave. Upon returning, they find more footage of the woman, confirming she has been in their home. As Yusuke calls the police, Motoko sees new footage showing themselves entering the room. Alone and scared, Motoko is confronted by the mysterious woman.