I'm from the Netherlands and we used to have filmnet at home, a paid movie channel. They would always show anime movies in the weekends. I think this movie was on in 1985/ 1986, something like that.
I only remember that the protagonists were a boy and a girl, possibly siblings. There was a war and huge stone or metal boulders. In the end the girl dies or ascends (?) while the boy stays behind. The reason he stays behind is because he is mentally not yet evolved enough to ascend.
The boy has brown hair. The two were young, possibly 13-14? There might have been a comical pet dog.
At the same time, Filmnet aired Magical Princess Minky Momo and the Fountain of Youth, but the setting and the atmosphere of both movies were very different.
Pretty vague, I know. But this is all I remember. I'll continue to add details as they come back to me, but as I said in the comments, I was 6,7 at the time and my memories are obscure. I wish I had a mind castle like Sherlock Holmes... :)