After finishing a business trip, Sagawa, the boss, and Shiina, a new employee, head to an inn where they will be staying, but run into a problem: only one room has been reserved. However, this was deliberately arranged by Shiina, who likes older men, so that she could stay in the same room as Sagawa. Shiina seduces Sagawa and they end up having a relationship. Although Sagawa feels guilty, he is swept away and becomes addicted...