Yumi Takigawa has always wanted to know what happened to her mother inside the mysterious Sacred Heart Convent. And now, as an "undercover sister," she'll get a firsthand look at the horrors within. Widely considered the most notorious nun-exploitation film, this shocker from Japanese director Norifumi Suzuki is packed with plenty of masochism -- including a legion of nuns armed with whips and a lesbian mother superior.

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