Katalina and Vera (Katarina to Vira) is the seventeenth episode of Granblue Fantasy: The Animation.
Vira releases Luminiera's power and attacks Gran and the others. When Katalina sees Vira go berserk, she's consumed with guilt. She decides to confront Vira in an attempt to make past wrongs.
In hopes of buying Katalina an opportunity to confront her former confidant, Gran and the others launch a counter-assault on Vira.
They manage to subdue her and Luminiera's power, though her will to fight remains as strong as ever. Katalina faces Vira to quell her rage and end the madness.