Oda Kaoru: Kifujin O-jô no etsuraku (1995)

Manako, the intelligent and elegant president's wife, is exhausted, although she doesn't show it on the surface. Her husband, a one-man company president and an energetic man, makes his secretary and club hostess his mistress. There was Kusaka, a subordinate of hers, who had feelings for Manako, but Manako's pride would not allow her to have a cheap affair. Her Manako had a twin sister, Mimiko, but this was her family's secret that even her husband didn't know about. Mimiko is a congenital infomaniac (nymphomaniac), and she is imprisoned in a villa near the sea...