Yuu, who took a leave of absence from work to become a full-time housewife, dutifully cares for her father-in-law. Aside from her husband's ED, she has no complaints—until one day the father-in-law discovers her ultra-thin thong among the laundry and becomes obsessively fixated on her beautiful ass. Driven by abnormal lust, he repeatedly forces himself on her, pushing Yuu to the extreme brink as he fills her with creampie after creampie, eventually impregnating her.