Chastity Hospitalized

Starring Akane Hotaru, Rio Hamasaki (Formely known as Erika Morishita back then) and Koharu. An otaku guy (nerdy) goes to a hospital because he has a high fever, but observes that the nurses in this hospital are horny nurses who love to blow and fuck their patients. While staying overnight there, he catches another patient trying to sexually pleasure the three nurses, so he intervenes and saves them, and they return their gratitude by group fucking him. In the end, he wakes up from his delusional stat and discovers it was all hallucinations from his fever. Video released in 2006.