Woman of the Lake (1966)

Miyako Mizuki ((Mariko Okada), a wife and mother, becomes romantically involved with Kitano, her interior decorator. At first a simple flirtation, the relationship soon develops into a passionate affair with secret meetings in seedy hotels. Miyako permits Kitano to take nude photographs of her as a keepsake. The negatives, however, fall into the hands of Ginpei Momoi, a teacher who has often observed the lovers in a hotel near his school. Obsessed with Miyako, Ginpei informs her that he has the negatives and arranges to meet her.