Located in a prime spot just 7 minutes on foot from the station, this 7-year-old apartment building offers convenient city living with fully furnished units equipped with appliances. A man working for the property management company possesses a tightly guarded master key, which he uses to sneak into the apartments where women live. One woman, estimated to be 25 years old and dressed like an office lady, returns home with chicken and champagne, preparing to spend a lonely Christmas evening. As she eats dinner, she murmurs sadly to herself, expressing her loneliness. Suddenly, her boss assigns her urgent work, forcing her to go out again to retrieve documents. Before leaving, she drinks a beverage laced with a substance, quickly losing consciousness. Taking advantage of the situation, the intruder sneaks in and sexually assaults the unconscious office worker.