Mai Ko Kashiwa lost her husband and has been living peacefully with her daughter and son-in-law. Though their quiet life continues, as a widow she has long endured physical longing. From her mature, alluring body emanates a powerful pheromone that envelops those around her. Her son-in-law secretly witnesses Mai Ko indulging in masturbation, and is overwhelmed by uncontrollable desire. Mai Ko, too, confronts her own repressed emotions, eventually reaching a point where she can no longer resist. The two are drawn deeper into a forbidden relationship.