A middle-aged man and a 19-year-old college girl have made a deal: for 500,000 yen she agrees to have daily "lessons" from him in sadomasochism for the duration of her summer vacation. In return, she asks of him only three things: 1) there will be no actual sex involved, 2) no one else will learn of their relationship, and 3) he will not fall in love with her. Thus begins a strange adventure involving a young woman's initiation into humiliation, submission, bondage, sensory deprivation, exhibitionism, pain, and much, much more. As for the man, he quickly learns to his chagrin that it is the third stipulation-that he will not fall in love with her-which proves to be the most fatal of all.