Yoko Shintani, an instructor at an aerobics school, secretly enjoys eavesdropping on the rooms next door. She eavesdrops on the frequent comings and goings of men by her neighbor, the model Reiko Saegusa. She relieves her frustrations as she is approaching marriageable age and her dissatisfaction with the school by eavesdropping. However, Yoko is also being watched by the photographer's assistant Naito through a telephoto lens. One night, Yoko hears Reiko's death throes. Thinking that Reiko has been murdered, Yoko calls the police, but...