Eriko, a life insurance agent, has an important contract signing today with a wealthy and kind man she has been proposing insurance to. Before the procedure, she is invited to a game by a man with a "wet fetish" and "mud fetish." The game involves finding the necessary items for the insurance contract a seal, a credit card, and an ID hidden somewhere in a mud pit. Eriko decides to participate and begins her search dressed in a dark gray business suit. Despite her efforts to protect her suit, she ultimately ends up diving into the mud, getting completely soaked and dirty...