Yuu and Yuria have to live with their new father due to their mother's remarriage. The two of them secretly worked in the sex industry, but one day, their father-in-law, without knowing that, called them for a threesome course. The two of them look down on the idea of sex work when they have a mother. Meanwhile, due to the recession, Yuu gets fired from her job at the sex industry. Yuu, who doesn't earn enough money, takes advantage of his father-in-law's love of adult entertainment and cultivates eroticism.