Nana is a capable career doctor working at a large hospital. While investigating an overwork death caused by medical malpractice three years ago, she discovers false entries in the investigation report. As she prepares to expose this, another medical accident occurs. The hospital director had been manipulating the investigation committee behind the scenes. Nana falls into a trap and is imprisoned in the hospital basement, subjected to indescribable sexual torture… Greasy beasts use their extensive knowledge of the human body to torment her relentlessly, but gradually, Nana's long-suppressed masochistic desires begin to surface and overflow violently.
