Arika, the princess of the Vespertatia royal family, led Ostia, the nation most actively striving to end the war before ruin. To achieve this, she needed "the invincible" Ala Rubra on her side. After making contact with Ala Rubra in the confederation, she was captured by an organization (for unknown reasons) while returning to Ostia. Simultaneously, Ala Rubra were accused of treason and had to flee from their former allies. Caught in this trap and pursued by both the empire and the confederation, they fought their way towards where Princess Arika and Princess Theodora of the Hellas Empire were being held captive. Ala Rubra and the two princesses then escaped to the Ala Rubra hideout. There, they concluded that high-ranking officials in Ostia were heavily corrupted by the enemy, leaving them with no allies in the empire, confederation, or Ostia. During the final battle, Arika managed to gather allies to contain the magic that would have destroyed the world. Details about what happened to her afterward are unclear.
In the manga, it is revealed that she is Negi's mother. In chapter 252, the New Ostia Governor-General refers to Negi as the "orphan son of Arika," implying her death. Chapter 257 reveals she was tried and executed 18 years ago for suspicion of collaborating with Cosmo Entelecheia. However, since Negi was born 10 years ago, it suggests a government cover-up after she was rescued by Nagi.
