What's the name of the manga/movie? Under unluck?
It's a bitter-sweet romance between an immortal and a mortal. Yet I hope for a good ending all the same :(
Yeah, their faces look cat-like, so that was my guess. Maybe she came in as a transfer student in high school, that way she would already be in puberty in the eyes of the public.
I think if they do marry each other, they will not have children, but if they do, they will be either fully human, half-human or fully nekomata. Then Mill will outlive her husband? I doubt the manga will show that.