In a certain provincial city, there is a rumored love hotel. It seems that perverts hold orgies at this hotel. The signal that you are "open to participate" is a slipper stuck in the door of the room. Rin works diligently, unaware that this is a den of perverts. One day, while cleaning the room, she accidentally forgets to put her slippers away and they get stuck in the door. She never knew that this would be the start of her getting caught up in a circle of men with perverted fetishes...