Masaru Konuma directs this 1970s landmark of Japanese exploitation cinema, a wildly over-the-top softcore S&M drama based on a book by famed erotic writer Oniriku Dan. Kunishada (Nagatoshi Sakamoto) is an unabashed pervert. One day, he happens upon his kimono-clad ex-wife, Akiko (Naomi Tani), kidnaps her, and drags her to a secluded old house up in the mountains. At first he merely ties her up and humiliates her, but after she cuts him with a razor the real horror show begins. Soon Akiko finds herself tied up in a variety of exotic knots and covered in hot wax. Later, after an escape attempt ends in Akiko being raped by two darkhearted hunters, she awakens sexually and starts to enjoy her debasement. About the same time, Kunishada discovers a suicide victim in a cave. What starts as a pleasant necrophilic fling abruptly ends when he realizes that the would-be suicide Kaoru (Terumi Azuma) is not quite dead.
by Jonathan Crow synopsis