Dan Oniroku's Beautiful Wives (2008)

Original title: 団鬼六 美人妻

Elite office worker Koji is involved in a hit-and-run accident while on a business trip, and is blackmailed by the victim, Genzo. He makes a living performing S&M shows and demands Koji's beautiful wife, Masako, as his slave. Realising he can't escape, and blinded by his ambition for career advancement, Koji hands Masako over to Genzo. Suddenly kidnapped, Masako is taken to Genzo's training room and subjected to unilateral S&M show training, enduring extreme humiliation. But soon, Masako finds herself captivated by the pleasure she experiences...