Garum serves as a Makai Alchemist within the Makai Order, operating from a hidden base where she monitors supernatural threats and coordinates Makai Knights. Her duties include dispatching knights to investigate Horrors like the Dead Tower Horror Nigra Venus in the ruined kingdom of Vazelia, and tracking magical artifacts such as Zirkel's Ring—a tool created by alchemist Mendoza, reactivated against the natural order.

She acts independently by secretly preserving Zirkel's Ring against orders, believing its power could be vital in critical battles despite its dangers. This choice later proves pivotal when the ring falls into enemy hands, enabling a plot to resurrect the dead and distort spacetime.

Garum's most significant act involves temporarily returning the deceased Makai Knight Germán Luis to the living world. She channels her power through her own body as an energy medium to re-materialize him for a limited time, enabling him to aid in rescuing his son Roberto and confronting the Horror threat at Vazelia, directly supporting León Luis and Alfonso San Valiante.

During the battle at an old cathedral, she intervenes to protect Germán and León, deploying a protective light barrier that shields them from an explosion detonated by Dario Montoya, the Obsidian Knight Zem. Her ongoing surveillance and communication provide vital intelligence, identifying Zem as the missing Makai Knight once assigned to Vazelia and confirming the enemy's plan to sacrifice Roberto to activate Zirkel's Ring.

Her knowledge of magical tools and dimensional mechanics remains essential to containing breaches in the natural order caused by the ring's reactivation.