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From 1968 to 1969, Daiei released a series of low-budget exploitation films, which it named the "Ero Guro/Unique Historical Drama" Line". This consisted of two series: the "Woman's Secret" series and the "Kanto Woman" series. Later, after their merger with Nikkatsu in 1970, two more films were released in the series.
A prostitute and her stepfather are falsely accused of murder, imprisoned, sexually abused and tortured. The real murderer will be discovered - and the girl will take revenge.
A woman joins a convent to investigate the suspicious death of her brother but nothing could prepare her for the horror and depravity that takes place behind the convent walls.
Two women are ferried to a small prison colony on the remote and barren prison island, where they and their fellow inmates are forced to perform perilous slave labor along the island’s treacherous cliffs, overseen by both an unforgiving sun and a crew of abusive male wardens. Meanwhile, the arrival of a newcomer among the island’s administrators, a disgraced policeman who is also the son of Nagasaki’s governor, creates dissension between the officials that, along with an untimely outbreak of bubonic plague on the island, ultimately sets the stage for a daring escape attempt on the part of the prisoners.
Shocking scenes are revealed in the Nagasaki Women's prison.
