Nanase visits a historic hot-spring inn with her fiancé to celebrate their engagement, only to be targeted by a sleazy employee who repeatedly preys on female guests. Her body, left unsatisfied by her sex life with her fiancé, awakens to excitement and pleasure unlike anything she has felt before. Gradually, she is conquered by the sensations and transformed into such an insatiable woman that even the experienced wife-stealer can barely handle her.