A well-maintained rental apartment building completed seven years ago, conveniently located just a seven-minute walk from the station with excellent access to downtown. Fully furnished with quality appliances and ideal living conditions, it remains highly popular among tenants. A male employee working for the management company one day obtains the master passkey, which had been strictly secured. A twisted desire begins to stir within him—his goal is to invade the private rooms of female residents. Estimated to be around 20 years old, he gives off a youthful, student-like appearance. One night, a tenant returns home late and decides to change into a Santa Claus costume she brought back, planning to enjoy some relaxing time. She chats on the phone with a university friend about outfits for an upcoming Christmas party. After hanging up, she unknowingly drinks a beverage that has been "spiked," quickly losing consciousness. Helpless and defenseless, she is molested while unconscious, her wet vagina forcibly penetrated and defiled by the man's erect penis.