well the hero route doesn't seem to involve aya, if you are asking how it's different from the normal ending, in the normal ending,(basically generic ntr) mc doesn't know or try to understand what's happening, at least until the end.
in the hero route, mc realize something is wrong and try to do something about it.
i think the dev said aya route is next after the hero route, so unless there is a change or a break, about 2 months from now aya route will begin.
i have no clue what the aya route is about, but we can assume there will be aya scenes.