Three years after getting married, Mio's husband's mother died and her father-in-law decided to live with her at her parents' house where she lived alone. One day, it turned out that her husband actually owed a large amount of money, and her father-in-law, who took over it, gradually demanded sexual acts on Mio. - She has nowhere to go and cannot refuse her father-in-law, and the act gradually escalates. And when my father-in-law learned that his husband would not return for a few days on a business trip, he finally planned a plan to fall Mio into pleasure with large-scale bondage training.