Hey

Rating: 6/10 (11 August 2014)

I try to find an old animation movie that I watched as a kid on TV in the 90s (it could be older) and made an enduring impression on me. I remember the ending most vividly: a bloody battle on the top of a hill where two armies clashed, apparently led by a man and a woman inside cyborgs or some kind of robotic vehicle. These two seemed to share a history (fling?? / siblings??) and confronted each other beside a nearby river. They both died. The movie ended tragically with a shot of the great tree on the top of the hill, surrounded by corpses of both armies..
The only other thing I recall is a young man and a woman that spent the night in a house and in the morning the woman transformed in a butterfly and flew away. The man tried to catch her but without success. The butterflies (souls??) seemed central to the movie.
It was all very depressing (as you can imagine :-P) but it was so powerful animation that stuck to my head for years! I tried to find it in IMDb, google and anime sites through keywords but to no avail. It seemed to be Japanese animation but I cannot be sure..