Natsuki and her husband run a hot spring inn that has been struggling financially due to recent economic downturns, barely managing to stay in business. Among their staff is Saishi, a long-serving servant who inherited the position from the previous generation, but whose arrogant attitude has become a constant source of stress for the couple. One day, a loan shark named Ishigami arrives demanding repayment from Saishi, who is deeply in debt. Desperate and cornered, Saishi makes an outrageous and irresponsible proposal—offering Natsuki, a beautiful young woman with a voluptuous figure, to settle his debt.