clashing ideals

In "Kuroneko", a woman and her daughter-in-law are raped and murdered by a roving band of samurai. After their death the woman and her daughter-in-law swear their loyalty to the devil in order for them to be able to return to the world as cat-like ghosts and kill every samurai they possibly can. They then lure unsuspecting samurai to their home, deep in a bamboo forest, where the daughter-in-law proceeds to get the samurai drunk and seduce them. When the samurai are at their most vulnerable the mother and daughter-in-law reveal their true forms and kill them.