Office worker Mayu Sakashita has been manipulated by the man she believed was her boyfriend into joining a pyramid scheme, leaving her burdened with debts to a loan shark. One day, Kinji, the head of the underground lending operation, gives her an unusual assignment: track down Chihiro, a woman who disappeared after borrowing a large sum of money and is said to be hiding while working at an unlicensed escort service. Kinji offers Mayu a deal - if she becomes one of his subordinates and goes undercover, risking her own body to infiltrate the operation, he will wipe out her debt. Desperate and seeing no other way out, Mayu eagerly accepts the offer...