Monica Campanella, a novel only character, is a citizen of Lotto Valentino in Italy during the 1700s. She was a classmate with Huey Laforet and later Elmer Albatross on Valentino's Alchemy Library under the watch of Dalton Strauss and Renee Paramedes Branvillier, her alchemy teachers.
Monica's Past Monica was born as Maribel Boroñal and was the second child of the Boroñal family. When she was ten years old, she attended a Dormentaires party along with her parents. During the event, the eldest son of the Boroñal Family, Gardi Dormentaire, attempted to sexually harass Monica. Just before he could lay his hands on Monica, her parents barged in to stop Gardi, but before Monica knew what was happening, she had grabbed a candlestick and lit Gardi's room on fire, accidentally killing Gardi. As it was impossible for the Dormentaires' to accuse Monica while leaving out his 'habits' and his murder of the late Boroñal Duke, Monica was forced to abandon her name and status, and the Dormentaires' covered the incident up as an accident. Five years after the incident, Monica's had acquired a new identity as the illegitimate half-sister of Esperanza, and lived her life as an alchemy student. In the morning, she would go to the Third Library to study Alchemy and after school, she would go to her home at an Patisserie, where the woman who works and lives there looks after her. Sometime after she enrolled at the Alchemy Academy, she began to have a crush on one of her classmates, Huey Laforet. ~!Due to her crush, she had stalked Huey to his headquarters and discovered that he was actually an counterfeiter responsible for replicating money that cannot be told apart from real money. In order to assist him, Monica became a masked serial killer named the Mask Maker to target key members of a drug trade to help Huey gain more profits without him knowing. Soon after Monica confessed her feelings for Huey, Monica and Huey meets Elmer C. Albatross, a new student at their class. Monica finds her past and her identity at risk when she discovers that principal Dalton had revealed information about every student to Elmer, as well as the fact that Elmer currently lives with her brother, Esperanza. When she realizes Elmer knows too much for her Mask Maker identity to be kept safe, she personally visits her brother's manor to threaten Elmer as Mask Maker that night. Much to her surprise, Monica discovers Elmer at her window later in the night when he confronts Monica about the truth. There, he suggests to Monica to pretend she had seen the Mask Maker to make Huey pay more attention to her. The next day, when Huey agreed to walk home with her for her safety, she finds strange men at the Patisserie confronting her guardian for Monica's whereabouts. Confused and surprised, Huey and Monica run away from the patisserie towards one of Huey's hideouts, where Huey reveals his role as the person responsible for the counterfeits. Monica does not yet reveal his knowledge, but when Elmer later comes barging in with a girl they had saved earlier, named Niki, Huey demands to know how Elmer knows of his hideout, and Elmer reveals that it was Monica who had told him. As Huey only officially introduced this place to Monica that night, Monica was forced to tell Huey how she knew, as well as the fact that she is the Mask Maker. Soon afterwards, with the help of Elmer and Esperanza, the angry mob that had been at the Patisserie were arrested. Monica then reveals to Huey and Niki that she is Esperanza's sister, and Huey decided to merge the Mask Maker and the counterfeit operation together, making Monica, Huey, Elmer and Niki the first members of the organization, the Mask Makers.
