In a certain hot spring town, there are a couple named Hoshino running an inn. However, due to economic hardship, their business has been struggling, and they find themselves in dire straits. Furthermore, the employee they inherited from the previous owner, a man named Saiji, has been causing them trouble with his poor work ethic. One day, Saiji owes money to a loan shark named Ishigami, who comes knocking to collect what he's owed. Desperate, Saiji suggests using the voluptuous body of their young maid, Natsuzuki, as collateral.
