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Cult pinku eiga director Masaru Konuma (Ikenie Fujin) turned his disapproving gaze on Christianity with this mean-spirited S & M film for Nikkatsu, which was drifting toward ever rougher fare at the time. Pop singer Runa Takamura of the group Golden Halves stars as Runa, a sad girl who joins a convent after her trampy stepsister, Kumi (Kumi Taguchi), steals her man. Unfortunately, life in the convent isn't exactly what Runa expects, as she is raped by a perverted priest (Robert Prinz), and enters a debauched world of sadomasochism, venality, and carnal abandon. A few years later, Runa is ready for revenge as she tries to get Kumi and her ex-boyfriend involved in a bogus Vatican scheme to promote Catholicism in Japan. As Konuma is not one to pull political punches for the sake of lightweight erotic fluff, the film is far more pointed than the numerous European "sexy nun" films it ostensibly resembles.