Kanna Uno's husband's father collapses, forcing her to take care of him. As he gradually recovers, his lower body regains strength as well. Soon, he starts making lewd comments, leaving Kanna flustered and distressed. Meanwhile, Kanna's own pent-up desires cause her body to grow increasingly sensitive despite his sexual harassment. Eventually, she begins craving physical contact with him, leading their relationship down a forbidden path.