Mari Yonezaki's life is turned upside down when she loses her home due to her husband's debts, forcing her to live with her only son, Masaru. Desperate for a place to stay, they stumble upon a condominium complex and are offered a "trial stay campaign" by a salesman, allowing them to temporarily reside there. The spacious bathtub and comfortable living space provide a healing balm for their weary souls. However, this comfort is short-lived as reality soon sets back in. The next day, the salesman returns, setting off a chain of new events.