When Aria was nineteen, they went to the Bangkok Institute together for their travel year. Aria introduced David as her sister, allowing her to be herself; her sister gave herself the name Diana, after the goddess and the namesake of their father's shop. One day, the siblings explored an island rumored to have Thotsakan demons; what they found were revenants. In the ensuing battle, Aria was fatally injured and she died shortly after, despite attempts by Catarina Loss to treat her. Diana, heartbroken, survived and assumed her sister's place after their parents falsely reported to the Clave that David had died instead of Aria.
Aria was a very accepting, understanding, and perceptive person.