Warning: Post contains spoilers.
So Hina and A-tan used to be good ole buddies back when Hina entered High School in Hakuo, but then grew distant to each other when Hina decided to call her “A-tan” (to act more friendlier to each other) and Athena saying that nobody was allowed to call her by that name eh? Meaning for sure that she still remembers Hayate? /facepalm
Looks like things are starting to get intense in Athens~