Newlywed bride Emiru begins taking care of her father-in-law while her mother-in-law is hospitalized. Feeling lonely during her husband's business trip, she unexpectedly discovers anal pleasure through her father-in-law. Night after night, she visits his room, continuously having her anus stimulated by him. Even after her husband returns home, Emiru finds her mind and body irresistibly drawn to her father-in-law. Obsessed with this pleasure, her relationship with him grows deeper.