Mary Tachibana, a smart and beautiful female manager who leads many male subordinates, was on a two-day, one-night business trip to the North Kanto branch with Tsukamoto, a young employee in his second year at the company who had joined the company after graduating. After completing a minute-by-minute schedule and checking into the city hotel in front of the station, she found that she had been assigned only one room in a twin room, perhaps due to a simple mistake or as part of the company's cost-cutting measures...!