Miyu is a shy college student who has little sexual experience, but fantasizes about being fucked by a man with a big dick. She has a boyfriend, Makoto, who is just as serious as her, but she is not satisfied with the sex she has with him. One day, Professor Oshima suggested that she go to a research camp with her boyfriend and classmates. Miyu disliked Oshima because of his overbearing and persistent personality, but she was forced to share a room with him at the camp, and before she knew it, she was seduced by his big dick and skilled erotic techniques.