Hihon: sode to sode AKA Secret Book: Sleeve and Sleeve (1974) - Akira Katô

Writer and ladies-man Yonosuke, who gives inept English lessons (using Shakespeare's Romeo and Juliet), is ushered into a lonely woman's house one rainy night. Her husband is at the front in the war with Russia and, as our hero will soon discover, she's wearing a chastitity belt...

Niizuma jigoku AKA Newlywed Hell (1975) - Akira Katô

The young and beautiful Yuki decides to leave her husband. She goes back to the place where she grew up. There she is initiated to S&M & bondage. But is it really the perfect cure to forget all about her past and regain happiness?

Doreizuma AKA Slave Wife (1976) - Akira Kato

Synopsis:
When a stuck-up and privileged lady of a wealthy family is left to fend for herself, her butler decides to teach her some overdue humility through BDSM. His spiral of debauchery is soon overtaken by madness, and his sex games threaten to harm more than just her social standing and pride... Perhaps the most sadistic and bizarre film in Nikkatsu's lengthy Oniroku Dan/Naomi Tani collaboration, SLAVE WIFE (aka Captured for Sex 3) is a disturbing portrait of a man who’s life as a servant has driven him to revenge and ultimate satisfaction, and the beautiful woman who must endure his perverted wrath. Be warned, the final act is NOT for those who don’t realize how nasty Nikkatsu’s Roman Porno line can get.