Whore hospital 4: no Pants nursing (2001)

Rumors were circulating that obscene medical examinations were being conducted at Murata Memorial Hospital. Seishi, who works for the Ministry of Health and Welfare, infiltrates the hospital to find out what's going on. There, his girlfriend Rin worked as a nurse. Okada, an inpatient, said that if he had a certain card given to the nurses, they would remove the accumulated material, and that the longer he stayed in the hospital, the more special treatment he would receive. That night, Seishi sneaks into Okada's room and sees him being serviced by a nurse. And he had a suspicion that the other person was Rin. Before long, Seishi was to receive the highest quality paradise treatment. Seishi uses sleeping pills to put Okada to sleep and enters the treatment room in his place, but...