In order to be released from the police, Fujiko has sex with Inspector Zenigata and is then told to protect a jewel studded mask worn by an opera singer named Ayan Maya from being stolen by Lupin. As the performance goes on tonight, a mysterious 'ghost of the opera' makes an attempt on Ayan's life. As Ayan faints from the experience, Fujiko is cast as her stand-in to draw out Lupin. However, Fujiko is soon trapped, discovering that the attempt on Ayan's life was a fake, while Lupin reveals the Ayan on stage is actually a stagehand. As Zenigata chases after Lupin, Fujiko chases after the ghost, Darenzo, and meets the real Ayan, who had been living underneath the opera house with Dorenzo. As Ayan explains the decisions she made, she decides to burn the mask before inviting Fujiko and Lupin to join them for dinner.