Kazuya witnesses the bizarre beheading of a man riding a motorcycle. While a suspect matching the description Victorique surmised is arrested a new girl joins Kazuya’s school who also matches the description.

The case of the beheaded man is brought to a close after Victorique reveals the true identity of the new student at the school.

Kujo and Avril explore one of the school's towers and Avril figures that it is related to the legend of Leviathan, an alchemist who lived there decades before. Victorique stumbles on a pop-up book containing a cryptic message aledgely from Leviathan himself and when a death occurs at the top of the tower, she decides to investigate by herself.

Victorique is dragged by her teacher to her classroom and is introduced to the rest of her classmates. Avril tries to bring her attention but she gets angry on her instead. Kujo demands Victorique to apologize to her, and when she refuses, he sets with Avril to keep investigating the Leviathan case without her help. Meanwhile Victorique has an encounter with Brian Roscoe, a friend of the victim's, on the top of the clock tower.

Kujo inquires Brian Roscoe regarding his connection to Victorique and her mother, but he only warns him to beware of her father instead. Meanwhile, Victorique succeeds to unlock the secrets behind Leviathan, the clock tower and the truth about her own origin.

Finding out that Victorique has been summoned yet again by her father, Kujo races to catch up with her, only for her to disappear again. The Inspector reveals to Kujo that Victorique might not be able to leave, unless she solves the case of Coco Rose, which revolves around a queen who was found beheaded within her quarters. Kujo decides to gather the Fragments of Chaos that Victorique can not assemble, only to discover that Cordelia was once a showgirl, who mysteriously went missing as did a woman who was a look-alike of Coco Rose. During his investigation, Kujo comes across Brian Roscoe - who lures him into an alleyway to an open window - guides him back into the theatre where Victorique is being held by her father and the guards, and is reunited with her once more. And as Victorique's father grants her the permission to leave and assemble the Fragments of Chaos, she declares that she will start the investigation - prompted by Kujo's findings - by going to the grave of the woman who resembled Coco Rose: Nicole Le Roux.

Upon investigating the grave of a woman with a striking resemblance to Queen Coco Rose, Victorique manages to put together the truth behind her mysterious demise. The truth of the Coco Rose case and the disappearance of Nicole Lulu is made clear, and Albert frees Victorique when she is unable to conclusively identify the murderer. On the way home to the Academy, Victorique and Kujo encounter a seemingly ordinary couple who are actually the still-living Coco Rose and her son fathered by Leviathan. Cordelia watches over them as they arrive home, and is soon joined by Brian and then a man who seems to be Brian's twin.