"Woman in a Box" series from Nikkatsu. This is the beginning and end of "Roman X" sub-line.
A young virgin is captured by an abnormal couple. The girl is kept locked in a wooden box, and subjected to sexual torture and abuse. Loosely inspired by the real-life case of Colleen Stan.
The manager of a ski resort kidnaps women, subjects them to various forms of sexual degradation and keeps his victims in a wooden box in the basement.
