Dorodarake no junjô (1977)

This is a story of love between a society girl and a yakuza boy. Mami lives an ordinary life in Tokyo, being with her friends and studying. Her biggest interest is ladies hats. She is rather well off, as her father is the ambassador of Japan in Spain. One day when she is out driving, she is attacked by a group of yakuza, but is saved by the honorable yakuza Jiro. This will change her life forever.