Yumi grows worried when her adult daughter Kanoko suddenly seems flush with cash. After finding a private sex video on Kanoko's phone, she realizes her daughter has appeared in porn and confronts director Horiguchi, demanding that he remove the stream. He refuses unless Yumi takes her place, so the mother makes her amateur porn debut to protect her daughter. Her sex-starved body soon drowns in pleasure heightened by humiliation, and before long she begins craving the thrill of escaping ordinary life.