After her husband dies, Ayano moves in with her daughter and son-in-law, Wataru. With a sweet child now in the family, the three generations live happily together—until Wataru finds himself increasingly drawn to Ayano’s mature beauty and enveloping sensuality, qualities his wife does not possess. One day, while Ayano and Wataru are weeding the garden alone, she becomes lightheaded and clings to him. With her suddenly so close, Wataru’s pent-up feelings erupt and he kisses her. Once their desire is ignited, they secretly indulge in forbidden pleasure behind his wife’s back.