Boss Sagawa and new graduate employee Shiina head to an inn to stay after a business trip, but run into trouble as only one room is booked. However, this was a deliberate arrangement by Shiina, who likes old men, so that she could stay in the same room as Sagawa. Shiina seduces Sagawa and ends up having an affair with him. Although Sagawa feels guilty, he gets carried away and becomes addicted to it...