Yuika is a rookie nurse who starts working at a hospital. Although somewhat clumsy, thanks to the head nurse Yui, who is sometimes gentle and sometimes strict, she works positively. One day, Yuika has to do the night shift with Yui and during a short break, she masturbates to calm her frustrated body. Unaware that Yui is watching her with the eyes of a predator... The night and the women will drive Yuika crazy...