There is a hot spring inn in a certain local city that is said to have erotic happenings when you stay there. The staff disguises themselves as guests and investigates to see if this is true! The truth is revealed one after another! The female hostess who comes to the inn for a drink becomes lewd when she gets drunk and has sex. The outcall massage girl is a dirty girl who follows her desires and has sex as much as she wants. A female assistant director gets caught up in a couple's sex and climaxes in a mixed-gender hot spring. You can't take your eyes off the reality of this hot spring inn where erotic happenings occur one after another!