Azusa begins living with her daughter and son-in-law. With her husband and daughter caught up in their busy lives, she gradually starts spending more time alone with her son-in-law. One night, while out drinking together, she is suddenly assaulted by him. After that night, he begins repeatedly targeting her big breasts, making aggressive moves toward her. Though she initially resists, Azusa slowly finds herself drawn to the thrill, her heart swayed by the forbidden excitement. Hidden within her everyday life, her desire and impulses grow deeper—leading her down a path of taboo temptation, NTR, and incest.