Natsuko lost her husband ten years ago and has continued living with her father-in-law and her husband's adult son. The insurance money left by her husband keeps them comfortable, yet something is missing: her sex drive has grown increasingly difficult to ignore. Since becoming a widow, she has avoided men and handled her needs alone. She never imagined that she would eventually be taken by both her father-in-law and adult stepson in this taboo family role-play.