Nun Story: Frustration in Black (The Nikkatsu Erotic Films Collection)

A young woman takes a vow to become a nun for the rest of her life. Now known as "Sister Maria," she settles in at the local monastery for her new life of poverty, chastity and obedience. Maria soon discovers something horrifying is happening within it's locked gates... Something beyond mere sin! The nuns are being mercilessly tortured and when they try to flee, they suffer a worse fate! After a brutal assault, Maria discovers she is now pregnant. Knowing it is strictly forbidden for any nun to have relations with men, Maria must figure out how to escape her own living Hell!