Reiko, a 25-year-old company receptionist, attends a Christmas party with her stylish sister and meets a single woman who becomes her romantic partner

On Christmas, Reiko, a 25-year-old receptionist, joined her sister at a party. Despite being single, she caught the attention of a man. After some small talk, he invited her to his place for a drink. Upon arriving, she was surprised to find her new friend already had his girlfriend waiting. Unfazed, she continued to chat with the man, leading to a steamy encounter.