Natsuko Hirashima is a beautiful doctor at a hospital where her husband, Goro, is the chairman. She also had a good reputation among patients. When she was on night duty, she also allowed relatives of hospitalized patients to stay overnight. However, the doctors and nurses were not aware that the surveillance cameras were installed there, claiming that she was there to monitor hospitalized patients 24 hours a day. The reason Natsuko allows her patient's relatives to stay the night is so that she can enjoy watching them secretly have sex on a monitor.