Cool Devices - Season 1 Episode 10 Operation 10: Binding

Masaki is on a train, dreaming about a woman he has never met. When he wakes up, he finds that his belongings have been stolen and that he is stranded. Masaki follows the woman who stole his things, which leads him to her mansion, where she lives with a group of other women. Masaki stays the night and soon realizes that he has stumbled into a S&M situation. The oldest woman is the mistress of the house and the younger women are her slaves. This leads to his voyeuristic observation of various sexual acts, before actually engaging in sex with several of the residents. Eventually there's an earthquake which destroys the house, though Masaki and one of the girls manage to escape. The episode ends with the two of them walking along the train tracks before a train roars towards them. Right before impact however, Masaki wakes up, still on the train with his sketch book in his lap. He opens the book and sees a drawing of the girl who left with him.