Sweet Whip

When Naoko was a freshman in high school she was kidnapped and imprisoned by a man who lived next door. For one month, she went through hell. Finally, she killed the man and escaped. Now as an adult, Naoko is a doctor specializing in infertility treatment, but she also has another side. Naoko is a popular master in a S&M club.
(Source: IMDb)
~~ Adapted from the novel "Amai Muchi" (甘い鞭) by Oishi Kei (大石圭).