Kounai Shinshuu ~Shimai Joi Chijoku no Iryou Kiroku~

The main character is a doctor and he lost his girl friend, who was a nurse, due to sudden illness. One night, he sees Shiho, a doctor, and her sister Rina, a training doctor, having a sex and overhears the fact that his girl friend's death was not caused by sudden illness. He starts to find out the facts and revenge on....