Mio attends an ikebana class. Her relationship with her husband is good, and she lives a fulfilling life. However, Kurihara, the instructor at the ikebana class, has harbored impure thoughts about her for some time and finally acts on them. Under the pretense of private lessons, he ties her up and rapes her, claiming 'This is to exorcise impure thoughts.' Since then, Mio is repeatedly raped by Kurihara. Eventually, the training play escalates, and changes begin to occur in Mio's mindset...
