Nina returned to the Holy Land of Swords. Now that she knew the level of strength that Eris wanted to reach, Nina was shocked. While shocked, the gaze that she turned on the endeavoring Eris had somewhat softened.
Then, since that time, Nina turned over a new leaf. She renewed the effort she had put in up until now, and to deal with cases where her sword broke again, she now carried two swords. She stopped looking down on attacks from Eris's fists, and distanced herself from the trivial acquaintances from her age group.
After that, she became a true rival to Eris but... That's another story.