What I'm really hoping for (though again, unlikely), is that Athena comes back to Japan, and then we have a love square with the main (?) heroines, Ayumu, Hina, Athena. This way, Athena can still have a chance. Though I guess there is still Nagi, Isumi, Izumi, and maybe Sakuya? At this point, I see Nagi and Hayate as more of sibling love than romantic love.
I mean, come on, its obvious Hayate and Athena still loves each other