The story follows Niido Akiho, an 18-year-old college student leading a fulfilling life, except for her unemployed sister, Natsuna, who is staying with her. Akiho struggles to manage her sister's untidy habits. Their situation takes a turn when Chifusa, a busty woman identifying herself as a "debt collectors," visits them. She informs Akiho that Natsuna has accumulated a debt of 3 million yen. Unable to repay the debt, Chifusa offers them a "Problematic Part-Time Job" in exchange for a high pay. The job's details remain confidential, leading to a slightly erotic work comedy about two sisters entangled in a peculiar debt.