Onibaba (1964)

It is the 14th century and Japan is in a civil war. In this scenario, a middle-aged woman and her daughter-in-law survive by killing samurai who wander into their swamp and selling the valuables they find. Both are devastated when they learn that Kichi, their son and husband, is dead, but her daughter-in-law soon begins an affair with a neighbor who survived the war, Hachi. The mother, in disagreement with this relationship, tries to frighten her daughter-in-law with a mysterious mask of Onibaba, the demon of revenge.