In a certain local city, there was a rumored love hotel. It seems that pervert enthusiasts hold orgies there. The signal for 'participation OK' is a pair of slippers wedged in the room's door. Unaware of this den of perverts, Rin works diligently and one day, while cleaning a room, accidentally forgets to put away the slippers, wedging them in the door. Little does she know that this will be the start of her getting drawn into the circle of perverted men...
