Miyu, a college student who fantasizes about being with a man with a large penis despite having little sexual experience. She has a boyfriend named Makoto, who is as serious as she is, but she was never satisfied with their sex. One day, at the suggestion of Professor Oshima, she went to a research camp with her boyfriend and classmates. Miyu disliked the domineering and persistent personality of Oshima, but at the camp, she unexpectedly ended up sharing a room with him and was eventually overwhelmed by his large size and skilled techniques.