Tres Marias Sannin no Sei Shojo

Dr. Fuwa was kicked out of the university hospital and lost his position as a researcher. He had no choice but to open a private clinic with a help of a lovely nurse who is willing to give him sexual pleasures. One day, he got a call from an old colleague at the university about a strange disease. The patient's name is Makoto Shinozuka. She is a nun in training. When the sun sets, she loses consciousness. She falls into a deep coma for the entire night. There is no way to wake her up, no matter what you try. They brought her into the university hospital and examined her using all the latest technologies. But they found nothing wrong with her. Ever since the exam whenever night falls, it no longer happened. That means the cause must be on the island where she lives. With few expectations, Dr. Fuwa has decided to go check the mystery of the island itself and the nuns who are residing there. He checked up the nuns in training in perverted way and fucks the nun in charge until a mysterious entity stops their sex session.