The Lady of Musashino (J-Movie) (1951)

Near the end of the War, Michiko, a middle-aged woman of samurai blood, flees Tokyo for her ancestral home in Musashino, accompanied by her husband Akiyama, a university professor of peasant stock. After her mother and father die in rapid succession, Michiko resolves to remain in the property which she has inherited and to live by the old-world code of her family, even if this means staying loyal to her loveless marriage and stoically resisting her mutual desire for a younger cousin, Tsutomu. Her husband, however, has designs on their flirtatious married neighbour Tomiko, who in turn has her eyes on Tsutomu, and when Michiko realises that her honour, her inheritance and the morals of her cousin are all at risk, she takes drastic measures to secure the continuity of all three in a changing world where she no longer has a place. (filmaffinity.com)