Satomi was seduced by her homeroom teacher Sawada during her high school days, and ever since then, she has been called in after school to be sexually trained. Ten years after graduating, she is living a happy married life as a young wife, but one day, Sawada happens to be passing by and calls her out, forcing her into his house. From then on, the SM training begins, as persistent as a snake... Satomi is tormented by disgust and guilt, but she faints at the pleasure of being a masochistic female that she had forgotten, and falls into a double life of being a masochistic slave, attending her husband's intense sex.