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From the liner notes

This collection includes:
Wife To Be Sacrificed, Cloistered Nun: Runa's Confession, Tattooed Flower Vase and Erotic Diary of an Office Lady

Wife To Be Sacrificed (1975)
In Wife To Be Sacrificed, Queen of Japanese erotica Naomi Tani plays Akiko, a wife who charges her husband with sexual battery. But he escapes from the police and goes into hiding. As three years pass, Akiko divorces him and tries to put the pieces of her life back in order. Suddenly, he returns. Full of rage and hatred, he kidnaps her and takes her to a house in a remote wooded area. There he disciplines Akiko vehemently, subjecting her to increasingly shocking forms of sexual torture, tetherings, and humiliations. Astonishingly, through the anger and lust, the pair develop a relationship that pushes the boundary of lurid passion and perverse obsession.

Cloistered Nun: Runa's Confession (1976)
Classic Japanese nunsploitation! In this "Roman Pink" feature, pretty Runa joins a convent when her stepsister steals her boyfriend. But to her surprise, Runa's life of devout religious observance doesn't exactly turn out the way she expects. Inside her cloistered domain, she discovers more perversity than anything she ever knew outside the convent walls. A few years pass, and Runa is ready for revenge against her stepsister and ex-boyfriend. She gets them involved in a bogus Vatican scheme to promote Catholicism in Japan, a plot development that makes Cloistered Nun: Runa's Confession far more politically pointed than the numerous European "sexy nun" films it resembles. Cult "pinku eiga" director Masaru Konuma (Wife to Be Sacrificed) shows that he does not pull punches for the sake of lightweight erotic fluff!

Tattooed Flower Vase (1976)
Mrs. Yoshino (played by Naomi Tani, the queen of Japanese erotica) is a beautifully elegant, maturing widow who lives a quiet existence with Takako, her teenaged daughter. But when Takako begins a relationship with the handsome Hideo, the simple mom suddenly discovers mysterious feelings of ecstasy and guilt. In Tattooed Flower Vase, these events are just the beginning of another "Roman Pink" tale of sexual intrigue. Hideo, we learn, has an uncanny similarity to the man that stole Mrs. Yoshino's virginity years before. As the story escalates, a severe and perverse rivalry develops between mother and daughter.

Erotic Diary of an Office Lady
In Erotic Diary of an Office Lady (aka OL Kanno nikki: Ah! Watashi no naka de), the fearless Asami Ogawa (Beautiful Girl Hunter) stars in her debut performance as a strait-laced office worker with an extremely kinky private life. Not only is Asami having an affair with her boss, she is also arranging trysts for her aging and widowed father. Made as part of the Nikkatsu Studio's "Roman Pink" collection of films, Erotic Diary of an Office Lady is the final and most infamous installment of the notorious "OL (Office Lady)" series.