Beast Alley(1965)

Original title: けものみち

Desperate to escape her grueling life caring for her paralyzed husband, Tamiko murders him and burns down their home to start anew. She is soon entangled in the dark web of an influential, elderly power broker, becoming his mistress and a pawn in his political schemes. As she descends further into a downward spiral of moral decay, Tamiko realizes that the freedom she sought is merely a new form of entrapment.