She tecnically never left hikki. She spent all summer in a fantasy world fooling around with computers.
Anyway, screw you, Akamatsu, for not having to balls to make a single clear conclusion or exaplanation in the end plus completely skiping the last boss fight
My money had always been in Asuna as to which girl got Negi. But meh, he clearly intends to keep milking this franchise, and he left more open plots that you can shake an artifact at to pursue if he wishes so in the future.