Minami is a housewife who lives a simple life with her beloved husband, trying to save money. But one day, her husband, Tsuyoshi, becomes obsessed with a shady investment seminar and loses all his assets, including his retirement benefits, and her daily life falls apart. As "collateral" for repaying his debts, she is taken captive by con man Yuta Aoi as a sex slave. As she is subjected to humiliating training, such as anal licking and blowjobs in public toilets, waterboarding at home, and being treated like a dog, Minami's mind and body begin to awaken to the pleasures of being a "sex slave"...