Natsuko Yoshino is unhappy when she's transferred to a different position within her company, because she feels she's given everything to her job. Just then, she comes across an advertisement that says, "Want to become a mistress?" The former office worker begins training to become the mistress of an inn. Her strong point is her physical strength, her weak point is she's very nosy. Natsuko enters the training program and faces only three hours of sleep each night, selfish guests, learning the cuisine, how to properly lay out futon. Every day someone drops out of the school, so who will be the last one standing? Can Natsuko make it through the rigorous training and learn who she is in the process?