three years after marriage, mio started living with her father-in-law in her husband's parents' house after her mother-in-law passed away. one day, it was revealed that her husband actually had a large amount of debt, and her father-in-law, who took over the debt, gradually began to demand sexual acts from mio. she has nowhere to go, so she can't refuse her father-in-law, and the acts gradually escalate. and when her father-in-law learned that her husband would not be returning for several days on a business trip, he finally devised a plan to plunge mio into pleasure with elaborate bondage training...