If you loved Cloistered Nun: Runa's Confession, try Woman in a Box: Virgin Sacrifice
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Cloistered Nun: Runa's Confession
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Woman in a Box: Virgin Sacrifice
What they share
Both films are directed by Masaru Konuma. If that's the register that drew you to Cloistered Nun: Runa's Confession, the second film will land in a comparable space — through a different lens.
What Woman in a Box: Virgin Sacrifice is
Basement. Hum of cicadas. A toolbox. Bound and gagged, a young woman awakens inside a cramped crate. Her captors, a man and woman, enact a perverse ritual of control. Konuma’s mondo-exploitation functions as a deranged missing-persons PSA.