Clotilde from the secret organization "For Your Eyes Only" and her friends are investigating the unprecedented theft of the royal rapier. The detective is helped by a mysterious person - a certain Spider. Thanks to him, agents find scammers who trade in forging paintings. While they are looking for the rapier, Ellen, Clotilde’s cousin, is being hunted by the eccentric maniac Beautiful Death. Many girls have gone missing, but Ellen wants to catch the criminal alone. He gets too close to her. Clotilde, wanting to save her cousin, impersonates her at a masquerade in honor of the Spring Equinox. Will they catch the maniac or won’t they make it in time, and then one of the detectives will disappear forever?