Armageddon: The Great Battle with Genma (1983) IMDb
Review refers to the English dub.
There is a certain amount of dreamy Rintaro goodness to the animation, but the poor quality of the dub and script (and score!) kill it for me.
References here: Kawajiri Yoshiaki tag description.
Japanese production animation fiction moving picture
Viewed 2018-11-14. Ugly in unsafe old browsers.