In a certain provincial city, there's a facility known as a love hotel. Rumors have spread about perverted enthusiasts secretly holding orgy parties inside. The signal for participation is a pair of slippers stuck in the door. This place was known as a hidden den for perverts, yet no one seemed to notice its existence. Rin Okae, a diligent worker, accidentally left a pair of slippers wedged in a door while cleaning one day. She never imagined this simple mistake would unknowingly pull her into the twisted world of these deviants.