Mariko grows worried by recent changes in her adult daughter Yuri. When she checks a video on Yuri's phone, she discovers privately filmed sex footage of her daughter. Mariko confronts director Umetani and demands that the stream be removed, but he threatens to spread the video unless she agrees to perform. Claiming she is doing it for her daughter, Mariko makes her indie porn debut, and her sex-starved body repeatedly erupts in intense orgasms heightened by humiliation.