Two beautiful sisters work as nurses. Yukine (older sister) notices something strange about Yura (younger sister) when she meets her for the first time in a while, and transfers to the hospital where her sister works to find out the cause. One day, late at night at the hospital, she witnesses her younger sister, who has been made a sex slave, sucking the dicks of patients and being raped. Wanting to save her sister, she approaches the dark side of the hospital with the help of senior nurse Yoshioka, but...