Demon's Room (1982)

Directed by Chūsei Sone

A wife gets a call from a man claiming to be from her husband's company. He tells her that he will come to pick her up on his behalf. But when he takes her to the hotel he locks her in a room and rapes her. The kidnapper then calls her husband but he doesn’t want a ransom. For reasons not yet known all he wants to do is to sexually humiliate her and to make sure the husband knows it.