Nana's husband works as a freelance writer, often keeping irregular hours at home. As he grows busier, he stops having sex with her. One day, Nana finds a BDSM porn video in his office. Angry and frustrated, she throws it into a garbage bag, but that act draws her into a twisted sexual entanglement with their neighbor. Bound so tightly she cannot move and brutally raped, Nana is overwhelmed by pleasure unlike anything she has felt before, even as she trembles at the eerie sense that someone is watching through a camera lens...