Elite investigator Mio is tracking down illegal drugs used at the scene of a series of sexual assault cases, going undercover as a nurse in a suspicious hospital. She discovers mysterious clinical trials taking place and begins her investigation, but is captured by the hospital director. Shortly after, she is forced to drink an aphrodisiac, her consciousness blurred, and is viciously assaulted by malicious men who repeatedly rape her. Tied down on an operating table, she is subjected to toy torture and rough titty fucking, then surrounded by patients who cum inside her one after another. The events of that day become the most terrifying and humiliating experience of Mio's life.