Masochist(1985)

Misa was accused of shoplifting and was stripped naked and searched. Her girlfriend, a nurse, met Yamaguchi, a doctor. Yamaguchi has deep wounds in his heart, and Misa watches over him. However, after a failed surgical operation, Yamaguchi transforms into a sadist and begins abusing Misa. She awakens to the world of masochists and realizes the joy of servitude.