The owner of a hot spring inn, Hirai, along with his maid attendant Kai, struggles daily to keep the business afloat. The inheritance passed down from his predecessor is gradually dwindling, and he faces constant threats from loan sharks. One day, two high school girls, Mio and Nana, arrive to work part-time as interns. Upon learning of their presence, the ruthless loan shark Kudo makes a heinous proposal: use the girls as companions to pay off the debt.