Housekeeper with Beautiful Skin: Made Wet with Finger Torture

A daughter living far away is worried about her father, Naruse, who is an elderly projectionist at a movie theater, so she sends a housekeeper. The housekeeper bears a vague resemblance to the father's wife, who died young. Not only does she resembles her, but she also knows things that only a married couple can know. Who is she really?