Beauty sisters working as nurses. Yukiko (elder sister) who felt strange to the appearance of Yura (younger sister) who met after a long time shifts to the hospital where the younger sister works to investigate the cause. One day, I witnessed a hospital in the late night, and the sister who was sex slave was pierced and fucked by the patient. I want to help my younger sister in the dark of the hospital under cooperation of senior nurse Yoshioka...