Akai Tôri-ame 1980 on netflix

An angry young man, who had been sentenced for rape, is freed from juvenile detention. He spots a lone woman who is taking a rest from driving and drags her into the woods to rape her. This experience destroys the woman’s marriage plans. Later she meets a sympathetic deliveryman and they become lovers. As she describes her past ordeal to him he begins to suspect that the assailant might be his younger brother. When the younger brother shows up the woman’s world is turned upside down again.