A high-class courtesan known as the exclusive companion of famous figures was rumored to have a face that no one had ever seen. Hearing this urban legend, the SOD investigation team managed to contact a prominent figure and uncovered the existence of a secret mistress club that provided women descended from supernatural beings. The investigators planted cameras at a private gathering of celebrities and headed to a designated hotel. When the doorbell rang, the door opened to reveal a mysterious yet seductive "faceless woman 'Airi'" standing before them.