High school teacher Miyoko and her younger brother Seiichi are living together. However, with the death of their mother, both sister and younger brother came to love each other as a man and a woman.
高中教师Miyoko和她的弟弟Seiichi住在一起。然而,随着母亲的离世,姐妹俩和弟弟都开始以男女之身份相爱了。