Mistress Natsume invites a couple over her house for a dinner party. Misaki, a friend from her days as a student and her boyfriend Akio. Misaki and she and her boyfriend decides to stay over for the night but to their surprise, this was all a trap set up by Mistress Natsume. Mistress Natsume then restrains the two while they sleep and starts to have some lesbian play right in front of the boyfriend. Now that the couple are confined to her house, Mistress Natsume continually trains them and Misaki starts to become attracted to the mistress and becomes a masochistic woman. Misaki then betrays her boyfriend and joins Mistress Natsume in the slave training. The cuckoldry begins when the girls make out in front of the boyfriend but the boyfriend starts to get excited by the cheating and the girls start to train the boyfriend who then slips deeper into being a slave.