College student Miharu is quiet, kind, and seems unlucky in life. People in society refer to someone with her personality as a 'dark type,' commonly known as 'yin-ko.' However, she unconsciously and unwittingly seduces men with her abnormal allure and well-developed body. Men are driven mad by her charm and lose their reason, some even resorting to violence. Her seminar professor, Tashiro, also reaches his limit and assaults her... Yet, she seems to accept it without expressing it in words.
